Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi Gabriel! Sunday 16, at 09:31:17 PM you wrote: > Oliver Joa wrote: > > Hi, > > > > Gabriel C wrote: > > > > [...] > > > Also have a look at Documentation/ide.txt. > >>> I read this already. Searching for "nodma" in this document gives only > >>> one line: > >>> > >>> "ide=nodma": disable DMA globally for the IDE subsystem. > >>> > >>> If the documentation is correct hda=nodma and ideX=nodma should not > >>> work. I use kernel 2.6.23.1 at the moment. > >> grep nodma Documentation/ide.txt > >> "hdx=nodma": disallow DMA > >> > >> ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option > >> is just for that HDD. > > > > > > /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt > > "ide=nodma": disable DMA globally for the IDE subsystem. > > > > /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt > > "ide=nodma": disable DMA globally for the IDE subsystem. > > > > /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt > > "ide=nodma": disable DMA globally for the IDE subsystem. > > > > Sorry, but I can not find this option, and it does not work. Which > > kernel do you use? > > This is my devel box , running 2.6.24-rc5-git Are you using modular or in-kernel IDE? Modules ignore cmdline options, so you must pass this parameter directly to ide_core (e.g. ide_core options="ide=nodma"). -- WBR et al. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi Gabriel! Sunday 16, at 09:31:17 PM you wrote: Oliver Joa wrote: Hi, Gabriel C wrote: [...] Also have a look at Documentation/ide.txt. I read this already. Searching for nodma in this document gives only one line: ide=nodma: disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. grep nodma Documentation/ide.txt hdx=nodma: disallow DMA ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD. /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. Sorry, but I can not find this option, and it does not work. Which kernel do you use? This is my devel box , running 2.6.24-rc5-git Are you using modular or in-kernel IDE? Modules ignore cmdline options, so you must pass this parameter directly to ide_core (e.g. ide_core options=ide=nodma). -- WBR et al. -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
> Isn't it more a matter of having a CF card that does do DMA and a > controller that does DMA, but a CF to IDE adapter that does not do DMA? Usually yes. If your CF card doesn't support DMA it will advertise PIO modes only and all will be well. If your card can do DMA it will advertise DMA modes regardless of whether your CF adapter has the needed pins wired. For UDMA it is even worse. Most CF adapters that can do DMA do not provide sufficient signal quality for UDMA. In addition if you hang them off a normal UDMA 2 device cable you are miles out of spec and some cards work some of the time. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Lennart Sorensen wrote: [...] Isn't it more a matter of having a CF card that does do DMA and a controller that does DMA, but a CF to IDE adapter that does not do DMA? If it is really a case of a CF card that claims to do DMA but is unstable if you try (I have found one model that does so), then it should simply be added to the ide dma blacklist instead. Maybe I will try this also, but for the moment it is running. I blacklisted 'SMART CF' on my system since they have random read errors and other i/o errors whenever DMA is enabled (while other cards work fine with DMA enabled). They claim to do DMA, but sure don't seem to do so reliably on this system. SiliconDrive CF works perfectly with DMA on the same system. It is working now with "hda=nodma" on kernel 2.6.24-rc5. Thanks to Bartlomiej Zolnierkiewicz who gave me the hint to use the newest kernel. Thanks to all. Olli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
On Sun, Dec 16, 2007 at 07:06:04PM +0100, Oliver Joa wrote: > how can I tell the kernel not to probe DMA for a specific harddisk (e.g. > hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. > The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, > the kernel boots about 2 minutes faster, but then I can not switch on > DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to > live with this 2 minutes waiting time or is there another solution? I > did not find any kernel-parameter for this purpose. > > Sorry if I ask here, but I can not find any solution, and I asked > already in other groups. Isn't it more a matter of having a CF card that does do DMA and a controller that does DMA, but a CF to IDE adapter that does not do DMA? If it is really a case of a CF card that claims to do DMA but is unstable if you try (I have found one model that does so), then it should simply be added to the ide dma blacklist instead. I blacklisted 'SMART CF' on my system since they have random read errors and other i/o errors whenever DMA is enabled (while other cards work fine with DMA enabled). They claim to do DMA, but sure don't seem to do so reliably on this system. SiliconDrive CF works perfectly with DMA on the same system. -- Len Sorensen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
On Monday 17 December 2007, Oliver Joa wrote: > Hi, > > Alan Cox wrote: > > [...] > > > For the current kernel and libata you can use libata.dma=3, and it will > > select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it > > should be sufficient to use hda=nodma > > Thanks a lot, but it does not work: > > If I use libata.dma=3 I get the following: > [0.00] Unknown boot option `libata.dma=3': ignoring > > And if I use hda=nodma: > [0.00] ide_setup: hda=nodma -- BAD OPTION > > I use kernel 2.6.21.5. > > Any Idea? "hdx=nodma" was added in 2.6.24-rc1, older kernels have only "ide=nodma" Also "ide=nodma" may not work in older kernel with some buggy host drivers (they were fixed in 2.6.24-rc1). Bart -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Alan Cox wrote: [...] For the current kernel and libata you can use libata.dma=3, and it will select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it should be sufficient to use hda=nodma Thanks a lot, but it does not work: If I use libata.dma=3 I get the following: [0.00] Unknown boot option `libata.dma=3': ignoring And if I use hda=nodma: [0.00] ide_setup: hda=nodma -- BAD OPTION I use kernel 2.6.21.5. Any Idea? Thanks Olli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Alan Cox wrote: [...] For the current kernel and libata you can use libata.dma=3, and it will select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it should be sufficient to use hda=nodma Thanks a lot, but it does not work: If I use libata.dma=3 I get the following: [0.00] Unknown boot option `libata.dma=3': ignoring And if I use hda=nodma: [0.00] ide_setup: hda=nodma -- BAD OPTION I use kernel 2.6.21.5. Any Idea? Thanks Olli -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
On Monday 17 December 2007, Oliver Joa wrote: Hi, Alan Cox wrote: [...] For the current kernel and libata you can use libata.dma=3, and it will select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it should be sufficient to use hda=nodma Thanks a lot, but it does not work: If I use libata.dma=3 I get the following: [0.00] Unknown boot option `libata.dma=3': ignoring And if I use hda=nodma: [0.00] ide_setup: hda=nodma -- BAD OPTION I use kernel 2.6.21.5. Any Idea? hdx=nodma was added in 2.6.24-rc1, older kernels have only ide=nodma Also ide=nodma may not work in older kernel with some buggy host drivers (they were fixed in 2.6.24-rc1). Bart -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
On Sun, Dec 16, 2007 at 07:06:04PM +0100, Oliver Joa wrote: how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Isn't it more a matter of having a CF card that does do DMA and a controller that does DMA, but a CF to IDE adapter that does not do DMA? If it is really a case of a CF card that claims to do DMA but is unstable if you try (I have found one model that does so), then it should simply be added to the ide dma blacklist instead. I blacklisted 'SMART CF' on my system since they have random read errors and other i/o errors whenever DMA is enabled (while other cards work fine with DMA enabled). They claim to do DMA, but sure don't seem to do so reliably on this system. SiliconDrive CF works perfectly with DMA on the same system. -- Len Sorensen -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Lennart Sorensen wrote: [...] Isn't it more a matter of having a CF card that does do DMA and a controller that does DMA, but a CF to IDE adapter that does not do DMA? If it is really a case of a CF card that claims to do DMA but is unstable if you try (I have found one model that does so), then it should simply be added to the ide dma blacklist instead. Maybe I will try this also, but for the moment it is running. I blacklisted 'SMART CF' on my system since they have random read errors and other i/o errors whenever DMA is enabled (while other cards work fine with DMA enabled). They claim to do DMA, but sure don't seem to do so reliably on this system. SiliconDrive CF works perfectly with DMA on the same system. It is working now with hda=nodma on kernel 2.6.24-rc5. Thanks to Bartlomiej Zolnierkiewicz who gave me the hint to use the newest kernel. Thanks to all. Olli -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Isn't it more a matter of having a CF card that does do DMA and a controller that does DMA, but a CF to IDE adapter that does not do DMA? Usually yes. If your CF card doesn't support DMA it will advertise PIO modes only and all will be well. If your card can do DMA it will advertise DMA modes regardless of whether your CF adapter has the needed pins wired. For UDMA it is even worse. Most CF adapters that can do DMA do not provide sufficient signal quality for UDMA. In addition if you hang them off a normal UDMA 2 device cable you are miles out of spec and some cards work some of the time. Alan -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Oliver Joa wrote: > Hi, > > Gabriel C wrote: > > [...] > Also have a look at Documentation/ide.txt. >>> I read this already. Searching for "nodma" in this document gives only >>> one line: >>> >>> "ide=nodma": disable DMA globally for the IDE subsystem. >>> >>> If the documentation is correct hda=nodma and ideX=nodma should not >>> work. I use kernel 2.6.23.1 at the moment. >> grep nodma Documentation/ide.txt >> "hdx=nodma": disallow DMA >> >> ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is >> just for that HDD. > > > /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt > "ide=nodma": disable DMA globally for the IDE subsystem. > > /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt > "ide=nodma": disable DMA globally for the IDE subsystem. > > /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt > "ide=nodma": disable DMA globally for the IDE subsystem. > > Sorry, but I can not find this option, and it does not work. Which > kernel do you use? This is my devel box , running 2.6.24-rc5-git > > Thanks > > Olli > Gabriel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
On Sun, 16 Dec 2007 19:06:04 +0100 Oliver Joa <[EMAIL PROTECTED]> wrote: > Hi, > > how can I tell the kernel not to probe DMA for a specific harddisk (e.g. > hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. > The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, > the kernel boots about 2 minutes faster, but then I can not switch on > DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to > live with this 2 minutes waiting time or is there another solution? I > did not find any kernel-parameter for this purpose. > > Sorry if I ask here, but I can not find any solution, and I asked > already in other groups. For the current kernel and libata you can use libata.dma=3, and it will select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it should be sufficient to use hda=nodma Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Gabriel C wrote: [...] Also have a look at Documentation/ide.txt. I read this already. Searching for "nodma" in this document gives only one line: "ide=nodma": disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. grep nodma Documentation/ide.txt "hdx=nodma": disallow DMA ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD. /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt "ide=nodma": disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt "ide=nodma": disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt "ide=nodma": disable DMA globally for the IDE subsystem. Sorry, but I can not find this option, and it does not work. Which kernel do you use? Thanks Olli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Oliver Joa wrote: > Hi, > > Gabriel C wrote: >> Oliver Joa wrote: >>> Hi, >> Hi Oliver , >> >>> how can I tell the kernel not to probe DMA for a specific harddisk (e.g. >>> hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. >>> The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, >>> the kernel boots about 2 minutes faster, but then I can not switch on >>> DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to >>> live with this 2 minutes waiting time or is there another solution? I >>> did not find any kernel-parameter for this purpose. >>> >>> Sorry if I ask here, but I can not find any solution, and I asked >>> already in other groups. >>> >>> Thank you very much >> Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your >> case is 0 ) > > I tried this already, it does not work. > >> Also have a look at Documentation/ide.txt. > > I read this already. Searching for "nodma" in this document gives only > one line: > > "ide=nodma": disable DMA globally for the IDE subsystem. > > If the documentation is correct hda=nodma and ideX=nodma should not > work. I use kernel 2.6.23.1 at the moment. grep nodma Documentation/ide.txt "hdx=nodma": disallow DMA ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD. Anyway I've CC'ed linux-ide. > > Thanks > > Olli > Gabriel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Gabriel C wrote: Oliver Joa wrote: Hi, Hi Oliver , how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Thank you very much Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 ) I tried this already, it does not work. Also have a look at Documentation/ide.txt. I read this already. Searching for "nodma" in this document gives only one line: "ide=nodma": disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. Thanks Olli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Oliver Joa wrote: > Hi, Hi Oliver , > > how can I tell the kernel not to probe DMA for a specific harddisk (e.g. > hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. > The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, > the kernel boots about 2 minutes faster, but then I can not switch on > DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to > live with this 2 minutes waiting time or is there another solution? I > did not find any kernel-parameter for this purpose. > > Sorry if I ask here, but I can not find any solution, and I asked > already in other groups. > > Thank you very much Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 ) Also have a look at Documentation/ide.txt. > Olli Gabriel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
How to Switch DMA off for only one Harddisk at Kernelboot
Hi, how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Thank you very much Olli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
How to Switch DMA off for only one Harddisk at Kernelboot
Hi, how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Thank you very much Olli -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Oliver Joa wrote: Hi, Hi Oliver , how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Thank you very much Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 ) Also have a look at Documentation/ide.txt. Olli Gabriel -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Gabriel C wrote: Oliver Joa wrote: Hi, Hi Oliver , how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Thank you very much Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 ) I tried this already, it does not work. Also have a look at Documentation/ide.txt. I read this already. Searching for nodma in this document gives only one line: ide=nodma: disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. Thanks Olli -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Oliver Joa wrote: Hi, Gabriel C wrote: Oliver Joa wrote: Hi, Hi Oliver , how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. Thank you very much Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 ) I tried this already, it does not work. Also have a look at Documentation/ide.txt. I read this already. Searching for nodma in this document gives only one line: ide=nodma: disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. grep nodma Documentation/ide.txt hdx=nodma: disallow DMA ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD. Anyway I've CC'ed linux-ide. Thanks Olli Gabriel -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Hi, Gabriel C wrote: [...] Also have a look at Documentation/ide.txt. I read this already. Searching for nodma in this document gives only one line: ide=nodma: disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. grep nodma Documentation/ide.txt hdx=nodma: disallow DMA ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD. /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. Sorry, but I can not find this option, and it does not work. Which kernel do you use? Thanks Olli -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
On Sun, 16 Dec 2007 19:06:04 +0100 Oliver Joa [EMAIL PROTECTED] wrote: Hi, how can I tell the kernel not to probe DMA for a specific harddisk (e.g. hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, the kernel boots about 2 minutes faster, but then I can not switch on DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to live with this 2 minutes waiting time or is there another solution? I did not find any kernel-parameter for this purpose. Sorry if I ask here, but I can not find any solution, and I asked already in other groups. For the current kernel and libata you can use libata.dma=3, and it will select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it should be sufficient to use hda=nodma Alan -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: How to Switch DMA off for only one Harddisk at Kernelboot
Oliver Joa wrote: Hi, Gabriel C wrote: [...] Also have a look at Documentation/ide.txt. I read this already. Searching for nodma in this document gives only one line: ide=nodma: disable DMA globally for the IDE subsystem. If the documentation is correct hda=nodma and ideX=nodma should not work. I use kernel 2.6.23.1 at the moment. grep nodma Documentation/ide.txt hdx=nodma: disallow DMA ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD. /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt ide=nodma: disable DMA globally for the IDE subsystem. Sorry, but I can not find this option, and it does not work. Which kernel do you use? This is my devel box , running 2.6.24-rc5-git Thanks Olli Gabriel -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
