[uClinux-dev] write peripheral user
Hi all, I am new with uclinux. I would like to read and write in a peripheral that I have put in uclinux. I use the kernel 2.4. I have seen on internet that uclinux has no MMU. So I think to I can write and read directly to the physical address of my peripheral. Is it possible to use this code to read and write directly to the physical address of my register? char *ptr = (char *)0x3000; *ptr=0x01; Is there a tutorial or anything else to write in a peripheral user? Thank you for your help, Sebastien ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] No PowerPC targets?
I bottom post. On 7/26/07, Robert S. Grimes [EMAIL PROTECTED] wrote: Probably because most PowerPC users seem to go full Linux and get the virtual memory benefits. It's what I would do. Regards, -Bob By full linux, do you mean like 2.6.22 from kernel.org ? If so, pardon my newbie question but I'm not sure how to get a .config for cross compiling 85xx so I can run menuconfig . I can get busybox and such from u-boot ELDK so really what I need is a recent kernel which has the drivers I need. I got a commercial kernel but its only 2.6.16 :-( . Thanks! Robert robert lazarski wrote: Is there some sort of philosophical reason why uClinux doesn't have any PowerPC targets? Lack of interest? We've been lurking on this list and seen a great community, yet we're not aware of any active community-based PowerPC distro. If curious, We're developing for the MPC8548 and we're looking for a community based 2.6.20 or later kernel for it based on the CDS reference. Robert ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
[uClinux-dev] GCC Optimization
Hello, How do I change the compiler optimization in uClinux from -O2 to -O0? Thanks! AM ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] GCC Optimization
Jivin amol sukerkar lays it down ... Hello, How do I change the compiler optimization in uClinux from -O2 to -O0? Thanks! Kernel or User ? Which versions ? Normally you can do this by editing your config.arch, some targets allow you to set LOPT and UOPT for library and user optimisations, Cheers, Davidm -- David McCullough, [EMAIL PROTECTED], Ph:+61 734352815 Secure Computing - SnapGear http://www.uCdot.org http://www.cyberguard.com ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] write peripheral user
Hi Daniele, Sebastien, Daniele Ziglioli wrote: Sebastien Baldacchino ha scritto: I am new with uclinux. I would like to read and write in a peripheral that I have put in uclinux. I use the kernel 2.4. I have seen on internet that uclinux has no MMU. So I think to I can write and read directly to the physical address of my peripheral. Is it possible to use this code to read and write directly to the physical address of my register? char *ptr = (char *)0x3000; *ptr=0x01; Is there a tutorial or anything else to write in a peripheral user? yes you can, but it's a good practice to use volatile keyword to avoid compiler optimization issue when access to hw registers. Example: #define CS1_BASE(0x4100) #define CPGA_LCD_D_W *((volatile unsigned char *)(CS1_BASE+0x100)) Some uClinux platforms by default will trap on this sort of thing. For example many of the ColdFire CPU's can trap on accesses to certain address regions when running in user mode. Typically it can be disabled though. Regards Greg Greg Ungerer -- Chief Software Dude EMAIL: [EMAIL PROTECTED] Secure Computing CorporationPHONE: +61 7 3435 2888 825 Stanley St, FAX: +61 7 3891 3630 Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
[uClinux-dev] [PATCH] NOMMU: Fix SYSV IPC SHM
From: David Howells [EMAIL PROTECTED]
Fix the SYSV IPC SHM to work with the changes applied by the new fault handler
patches when CONFIG_MMU=n.
Signed-off-by: David Howells [EMAIL PROTECTED]
---
fs/ramfs/file-nommu.c |7 ++-
ipc/shm.c |2 ++
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index cad2b7a..237fe8b 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -295,5 +295,10 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file
*file,
*/
int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
{
- return vma-vm_flags VM_SHARED ? 0 : -ENOSYS;
+ if (!(vma-vm_flags VM_SHARED))
+ return -ENOSYS;
+
+ file_accessed(file);
+ vma-vm_ops = generic_file_vm_ops;
+ return 0;
}
diff --git a/ipc/shm.c b/ipc/shm.c
index d0259e3..d88ac5a 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -268,7 +268,9 @@ static int shm_mmap(struct file * file, struct
vm_area_struct * vma)
if (ret != 0)
return ret;
sfd-vm_ops = vma-vm_ops;
+#ifdef CONFIG_MMU
BUG_ON(!sfd-vm_ops-fault);
+#endif
vma-vm_ops = shm_vm_ops;
shm_open(vma);
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Re: [uClinux-dev] uClinux supports shared memory IPC?
Allen Yang [EMAIL PROTECTED] wrote: What was errno? No error/warning messages. From the return value (-1), I know shared memory creation failed. Yes, but without knowing the error put in errno by shmget(), it's difficult to say why it failed. shmget(4096, 4096, IPC_CREAT|0x1b6|0666) = -1 EINVAL (Invalid argument) strace shows that error EINVAL was returned. I tried putting printk() in do_shmat(), sys_shmget(), shm_init() in ipc/shm.c. I found that shm_init() was called, but do_shmat() and sys_shmget() were NOT called. Hmmm... Can you put a few printk()'s in arch/m68knommu/kernel/sys_m68k.c, in sys_ipc()? Can you print the call ID on entry, and put a printk() by each error return so that you can tell which it returns through? David ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] No PowerPC targets?
Wolfang Denk's site is the place to go for PowerPC: http://www.denx.de/ cheers rick robert lazarski schrieb: They do, but only 2.6.14 ;-( . On 7/26/07, Andrew Webster [EMAIL PROTECTED] wrote: Try Freescale's web site, they probably have a linux distro (LTIB) for that part. Andrew On 7/26/07, robert lazarski [EMAIL PROTECTED] wrote: I bottom post. On 7/26/07, Robert S. Grimes [EMAIL PROTECTED] wrote: Probably because most PowerPC users seem to go full Linux and get the virtual memory benefits. It's what I would do. Regards, -Bob By full linux, do you mean like 2.6.22 from kernel.org ? If so, pardon my newbie question but I'm not sure how to get a .config for cross compiling 85xx so I can run menuconfig . I can get busybox and such from u-boot ELDK so really what I need is a recent kernel which has the drivers I need. I got a commercial kernel but its only 2.6.16 :-( . Thanks! Robert robert lazarski wrote: Is there some sort of philosophical reason why uClinux doesn't have any PowerPC targets? Lack of interest? We've been lurking on this list and seen a great community, yet we're not aware of any active community-based PowerPC distro. If curious, We're developing for the MPC8548 and we're looking for a community based 2.6.20 or later kernel for it based on the CDS reference. Robert ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] No PowerPC targets?
Wolfgang's ELDK has kernel-source-2.6.19.2-1.noarch.rpm , and I need 2.6.20 for a sata driver that got merged. Unless a new ELDK version comes out I'm probably going to have to go with kernel.org . There be demons going that way? Robert On 7/26/07, Richard Klingler [EMAIL PROTECTED] wrote: Wolfang Denk's site is the place to go for PowerPC: http://www.denx.de/ cheers rick robert lazarski schrieb: They do, but only 2.6.14 ;-( . On 7/26/07, Andrew Webster [EMAIL PROTECTED] wrote: Try Freescale's web site, they probably have a linux distro (LTIB) for that part. Andrew On 7/26/07, robert lazarski [EMAIL PROTECTED] wrote: I bottom post. On 7/26/07, Robert S. Grimes [EMAIL PROTECTED] wrote: Probably because most PowerPC users seem to go full Linux and get the virtual memory benefits. It's what I would do. Regards, -Bob By full linux, do you mean like 2.6.22 from kernel.org ? If so, pardon my newbie question but I'm not sure how to get a .config for cross compiling 85xx so I can run menuconfig . I can get busybox and such from u-boot ELDK so really what I need is a recent kernel which has the drivers I need. I got a commercial kernel but its only 2.6.16 :-( . Thanks! Robert robert lazarski wrote: Is there some sort of philosophical reason why uClinux doesn't have any PowerPC targets? Lack of interest? We've been lurking on this list and seen a great community, yet we're not aware of any active community-based PowerPC distro. If curious, We're developing for the MPC8548 and we're looking for a community based 2.6.20 or later kernel for it based on the CDS reference. Robert ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
RE: [uClinux-dev] uClinux supports shared memory IPC?
Hi, Gerrit. 1. CONFIG_TMPFS is already set to y 2. directory /dev/shm is already in my current image 3. tmpfs is not in my system. So I used mount -t tmpfs tmpfs /dev/shm. Then I double checked: # mount /dev/rom0 on / type romfs (ro) /proc on /proc type proc (rw) rwfs on /mnt/rwfs type ramfs (rw) rwfs on /tmp type ramfs (rw) rwfs on /etc type ramfs (rw) rwfs on /var type ramfs (rw) sysfs on /sys type sysfs (rw) tmpfs on /dev/shm type tmpfs (rw) tmpfs is now in my system. 4. I tried my test program. It still didn't work. shmget() still returns -1. Regards, Allen Yang From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gerrit Binnenmars Sent: Thursday, July 26, 2007 12:41 PM To: uClinux development list Subject: Re: [uClinux-dev] uClinux supports shared memory IPC? Hello Allen, Since 2.6.15 uClinux has support for shared memory. Do the following steps: - compile your kernel with CONFIG_TMPFS - mkdir /dev/shm - mount -t tmpfs tmpfs /dev/shm Now shared memory should be working! Greetings Gerrit Datum: 26/07/07 11:11 AM Van: David Howells Aan: uClinux development list CC: Onderwerp : Re: [uClinux-dev] uClinux supports shared memory IPC? Allen Yang wrote: I am using ColdFire MCF5329EVB and uClinux (2.6.17 kernel, uClibc 0.9.27). 2.6.17 certainly has support for it. Can you check CONFIG_TINY_SHMEM=y and CONFIG_RAMFS=y? The compilation was OK. However, when I downloaded to my board, the shared memory creation always failed. shmid was always -1. What was errno? Also, can you strace your test program to make sure that it's not the C library aborting the call before the kernel is consulted? Alternatively, you could put a printk() in do_shmat() in the kernel to see if it actually gets there. David ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev The information contained in this email and attachments to this email are the proprietary and confidential property of Nucomm, Inc. The information is provided in strict confidence and shall not be reproduced, copied, or used (partially or wholly) in any manner without prior, express written authorization of Nucomm, Inc. ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] No PowerPC targets?
Probably because most PowerPC users seem to go full Linux and get the virtual memory benefits. It's what I would do. Regards, -Bob robert lazarski wrote: Is there some sort of philosophical reason why uClinux doesn't have any PowerPC targets? Lack of interest? We've been lurking on this list and seen a great community, yet we're not aware of any active community-based PowerPC distro. If curious, We're developing for the MPC8548 and we're looking for a community based 2.6.20 or later kernel for it based on the CDS reference. Robert ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] No PowerPC targets?
Jivin Robert S. Grimes lays it down ... Probably because most PowerPC users seem to go full Linux and get the virtual memory benefits. It's what I would do. A common misconception is that the uClinux-dist is only for !MMU systems :-) If has support for all systems, MMU and not. In fact, we do not even build non MMU enabled systems and it's basically our source tree :-) There are active targets in the tree for x86, m68knommu, armnommu, microblaze arm, mips, superh and probably some more. I'd imagine that at least half the targets are for MMU enabled systems. To add PPC support would only require a few files and some setup time. create vendors/config/ppc (look at the arm or sh dirs) create target: vendors/Vendor/Board/* Use another board as an example, ask if you need to find an appropriate one. Hopefully from there you can start configuring and building. There is doc in the toplevel Documentation dir that has more on this. We would be more than happy to have people contributing PPC targets :-) Cheers, Davidm robert lazarski wrote: Is there some sort of philosophical reason why uClinux doesn't have any PowerPC targets? Lack of interest? We've been lurking on this list and seen a great community, yet we're not aware of any active community-based PowerPC distro. If curious, We're developing for the MPC8548 and we're looking for a community based 2.6.20 or later kernel for it based on the CDS reference. Robert ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev -- David McCullough, [EMAIL PROTECTED], Ph:+61 734352815 Secure Computing - SnapGear http://www.uCdot.org http://www.cyberguard.com ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
[uClinux-dev] Release file cache memory
Hi, I'm using uClinux-2.4.22 with 64MB memory. The kernel is configured with non power-of-2 kernel allocator. My application always deal with large files. Every time I read a large file, free memory goes down to approximately 8MB and then back to 40MB. That's file cache right? It goes well most of the time. But some times the file cache won't release, making free memory deadly low. At that moment free memory will loop from about 0KB to 400KB. Could anyone tell me why the cached memory won't release? Or how can I tell kernel to release file cache? brs, Edward ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
[uClinux-dev] ramdisk.gz and ramdisk address allocation in RAM
Hello. I have an IXP425 dev. board with 64M RAM and 16M Flash. Redboot doing: 1. zImage - 0x160 2. ramdisk.gz - 0x080 3. go 0x160 My ramdisk size = 8192. And all works ok. But i need to increase ramdisk to 16M (or to 12M). But there is a problem: 0x160 - 0x080 = 0x0E0 (14M). ramdisk.gz ~ 2M, what can be maximum size of uncompressed ramdisk? I think, than in my situatition the sum of ramdisk and ramdisk.gz can't be 14M? Where will be uncompressed ramdisk allocated? Can i change it position? Thanks. ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] uClinux supports shared memory IPC?
Gerrit Binnenmars [EMAIL PROTECTED] wrote: - mkdir /dev/shm - mount -t tmpfs tmpfs /dev/shm These two steps ought to be unnecessary as init_tmpfs() in mm/tiny-shmem.c creates the superblock by doing an internal mount. David ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] write peripheral user
On Thursday 26 July 2007 11:08, Sebastien Baldacchino wrote: [...] I have seen on internet that uclinux has no MMU. So I think to I can write and read directly to the physical address of my peripheral. Operating systems don't have an MMU, CPUs have an MMU. What CPU are you using? -- Chris Gray/k/ Embedded Java Solutions BE0503765045 Embedded Mobile Java, OSGihttp://www.k-embedded-java.com/ [EMAIL PROTECTED] +32 3 216 0369 Skype: k.embedded.chris ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] GCC Optimization
Thanks, David! I was actually asking about both 2.4.x and 2.6.x and not for kernel but user/. AM On 7/26/07, David McCullough [EMAIL PROTECTED] wrote: Jivin amol sukerkar lays it down ... Hello, How do I change the compiler optimization in uClinux from -O2 to -O0? Thanks! Kernel or User ? Which versions ? Normally you can do this by editing your config.arch, some targets allow you to set LOPT and UOPT for library and user optimisations, Cheers, Davidm -- David McCullough, [EMAIL PROTECTED], Ph:+61 734352815 Secure Computing - SnapGear http://www.uCdot.org http://www.cyberguard.com ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
