[U-Boot] U-boot environment redundancy
Hello, I have some query regarding how the u-boot environment redundancy works. As per my understanding, we need to set the CONFIG_ENV_ADDR_REDUND and CONFIG_ENV_SIZE_REDUND macros in the board config file. The boot loader is supposed to read the both the environments and based on the obsolete/active flag in the environment and CRC check, determine which environment to pick up. And the logic for reading both environments, determining which one to use goes into the medium specific file, like env_nand.c or env_flash.c. 1. Whether this understanding of mine is correct? 2. Everytime when we do saveenv, how does boot loader determine which range to save the env? 3. The env rotation is automatically by boot loader that is the obsolete/active flag change? The active/ obsolete flag is supposed to be part of the env itself? 4. If I need to implement all this for MMC, do I need to add more logic to the MMC patch http://article.gmane.org/gmane.comp.boot-loaders.u-boot/71792/match=environment+mmc submitted in recent past? regards -Nitin Get your preferred Email name! Now you can @ymail.com and @rocketmail.com. http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Saving environment variables in MMC
Hello, --- On Thu, 1/4/10, Detlev Zundel d...@denx.de wrote: From: Detlev Zundel d...@denx.de Subject: Re: [U-Boot] Saving environment variables in MMC To: nitin...@yahoo.com Cc: U-Boot user list u-boot@lists.denx.de Date: Thursday, 1 April, 2010, 5:35 PM Hi Nitin, It is rather common to write to the U-Boot environment in projects for example to switch to a new set of kernel+file system after an update from within linux for the next boot. My use case is exactly same, to switch to a new set of kernel+fs after an update for the next boot. I also have another usecase of updating the env variable 'bootargs' if required in the field. So this use-case combined with fw_env, what is your feedback? It is doable of course. Maybe if I did not mention it before, I advise using a redundant environment for such procedures so that even a powerloss during this upgrade will not brick the device. Can I get some pointers to some example implementation of a redundant environment. I mean how does a switching between the environments happen? Who clears or sets the obsolete flag for the redundant env? -Nitin Could you give me some pointers on upgrading u-boot itself, but I don't have a spare partition for that. I would have to replace working copy itself? I would not recommend upgrading U-Boot in the field. As it is not possible to build in redundancy for U-Boot (on most systems I know), there is always the possibility to kill the device with such an update. I would wanted to have more info(in addition to what I have implemented) regarding the failsafe upgrade mechanisms for embedded-linux apps and kernel? Could you please point me to right forums regarding this. I understand that this is not specific to u-boot, but just give me some pointers. I'm sorry that I cannot point you to a ready to use recipe here, as this really depends on your strategy regarding upgrades, i.e. will you do the upgrade from within Linux? (judging by your questions, you will...) Do you have enough ressources to keep two self-contained program images (at least kernel+dtb+rootfs) so you can always update the other half? If not, you will probably want to build a non-upgradeable fallback system which is only capable to update the other part. As you see, solving your problem really requires you to define your problem more rigorously first. In order to protoect against interrupts during the update, you may very well want to have a watchdog on your system and use the bootcount (grep the documentation for it) feature of U-Boot to detect failing boot attempts. I hope this is enough to get you started. Cheers Detlev -- Thanks so much for Emacs. What a wondrous system -- one of the real seven wonders of the world. Forced to choose between Emacs and, say, any pyramid, I'd take Emacs. -- Robert Boyer -- DENX Software Engineering GmbH, MD: Wolfgang Denk Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de New Email names for you! Get the Email name you#39;ve always wanted on the new @ymail and @rocketmail. Hurry before someone else does! http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Saving environment variables in MMC
Hello, thanks for your valuable inputs. --- On Thu, 1/4/10, Detlev Zundel d...@denx.de wrote: From: Detlev Zundel d...@denx.de Subject: Re: [U-Boot] Saving environment variables in MMC To: nitin...@yahoo.com Cc: U-Boot user list u-boot@lists.denx.de Date: Thursday, 1 April, 2010, 5:35 PM Hi Nitin, It is rather common to write to the U-Boot environment in projects for example to switch to a new set of kernel+file system after an update from within linux for the next boot. My use case is exactly same, to switch to a new set of kernel+fs after an update for the next boot. I also have another usecase of updating the env variable 'bootargs' if required in the field. So this use-case combined with fw_env, what is your feedback? It is doable of course. Maybe if I did not mention it before, I advise using a redundant environment for such procedures so that even a powerloss during this upgrade will not brick the device. I will grep the mailing list archives for more info on the redundant environment technique. Could you give me some pointers on upgrading u-boot itself, but I don't have a spare partition for that. I would have to replace working copy itself? I would not recommend upgrading U-Boot in the field. As it is not possible to build in redundancy for U-Boot (on most systems I know), there is always the possibility to kill the device with such an update. I would wanted to have more info(in addition to what I have implemented) regarding the failsafe upgrade mechanisms for embedded-linux apps and kernel? Could you please point me to right forums regarding this. I understand that this is not specific to u-boot, but just give me some pointers. I'm sorry that I cannot point you to a ready to use recipe here, as this really depends on your strategy regarding upgrades, i.e. will you do the upgrade from within Linux? (judging by your questions, you will...) Do you have enough ressources to keep two self-contained program images (at least kernel+dtb+rootfs) so you can always update the other half? If not, you will probably want to build a non-upgradeable fallback system which is only capable to update the other part. As you see, solving your problem really requires you to define your problem more rigorously first. In order to protoect against interrupts during the update, you may very well want to have a watchdog on your system and use the bootcount (grep the documentation for it) feature of U-Boot to detect failing boot attempts. Ya I did that, implemented the store bootcount and load bootcount routines for OMAP 35x. regards -Nitin I hope this is enough to get you started. Cheers Detlev -- Thanks so much for Emacs. What a wondrous system -- one of the real seven wonders of the world. Forced to choose between Emacs and, say, any pyramid, I'd take Emacs. -- Robert Boyer -- DENX Software Engineering GmbH, MD: Wolfgang Denk Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de New Email addresses available on Yahoo! Get the Email name you#39;ve always wanted on the new @ymail and @rocketmail. Hurry before someone else does! http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Saving environment variables in MMC
Hello, --- On Wed, 31/3/10, Stefano Babic sba...@denx.de wrote: From: Stefano Babic sba...@denx.de Subject: Re: [U-Boot] Saving environment variables in MMC To: nitin...@yahoo.com Cc: Frans Meulenbroeks fransmeulenbro...@gmail.com, U-Boot user list u-boot@lists.denx.de Date: Wednesday, 31 March, 2010, 4:17 PM Frans Meulenbroeks wrote: 2010/3/30 Nitin Mahajan nitin...@yahoo.com: Hi, Found this in the past: http://bitshrine.org/gpp/u-boot-200910-cd77dd10-save-the-env-var-to-SDcard-and-SPI.patch You can take a look at this one, too: http://lists.denx.de/pipermail/u-boot/2009-November/063775.html Thanks for the information. I just wanted to have a feedback, whether having a use-case of writing env variables from Linux User space is a good idea or is not recommended? regards -Nitin New Email addresses available on Yahoo! Get the Email name you#39;ve always wanted on the new @ymail and @rocketmail. Hurry before someone else does! http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Saving environment variables in MMC
Thanks Detlev, --- On Wed, 31/3/10, Detlev Zundel d...@denx.de wrote: From: Detlev Zundel d...@denx.de Subject: Re: [U-Boot] Saving environment variables in MMC To: nitin...@yahoo.com Cc: U-Boot user list u-boot@lists.denx.de Date: Wednesday, 31 March, 2010, 8:04 PM Hi Nitin, Thanks for the information. I just wanted to have a feedback, whether having a use-case of writing env variables from Linux User space is a good idea or is not recommended? You found tools/env/fw_env.c showing that this functionality is indeed foreseen and used. It is rather common to write to the U-Boot environment in projects for example to switch to a new set of kernel+file system after an update from within linux for the next boot. My use case is exactly same, to switch to a new set of kernel+fs after an update for the next boot. I also have another usecase of updating the env variable 'bootargs' if required in the field. So this use-case combined with fw_env, what is your feedback? Could you give me some pointers on upgrading u-boot itself, but I don't have a spare partition for that. I would have to replace working copy itself? I would wanted to have more info(in addition to what I have implemented) regarding the failsafe upgrade mechanisms for embedded-linux apps and kernel? Could you please point me to right forums regarding this. I understand that this is not specific to u-boot, but just give me some pointers. regards -Nitin Is this feedback enough? Cheers Detlev -- The structure of a system reflects the structure of the organization that built it. -- Richard E. Fairley -- DENX Software Engineering GmbH, MD: Wolfgang Denk Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de Get your new Email address! Grab the Email name you#39;ve always wanted before someone else does! http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
[U-Boot] U-boot env variables parsing
Hi!
I am doing env settings some thing like this,
ROOT1=/dev/mmcblk0p1
ROOT2=/dev/mmcblk0p2
ROOT=${ROOT1}
bootargs1=console=ttyS0,115200n8 mem=256M noinitrd rw rootdelay=1 ${ROOT}
when I say 'setenv bootargs ${bootargs1}', ${ROOT} gets resolved to 'ROOT1', it
does not get completely resolved to '/dev/mmcblk0p1'.
Is there something fundamentally wrong in setting the env variables this way?
What would be the right way to achieve this, as I want ROOT to be ${ROOT1}
sometimes and ${ROOT2} some times?
regards
-Nitin
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Re: [U-Boot] Saving environment variables in MMC
Hello, --- On Mon, 29/3/10, Mike Frysinger vap...@gentoo.org wrote: From: Mike Frysinger vap...@gentoo.org Subject: Re: [U-Boot] Saving environment variables in MMC To: u-boot@lists.denx.de, nitin...@yahoo.com Date: Monday, 29 March, 2010, 11:12 PM On Monday 29 March 2010 11:21:22 Nitin Mahajan wrote: I want to save and retrieve environment variables from a file in MMC. Can I get some pointers towards this? Whether env_relocate_spec() and other such functions, has some implementation for MMC also? search the archives. some people have posted some patches recently. -mike I checked the mails and I would go through the patches. In addition to this, I need to modify the environment variables(stored in a file) from Linux userland. Whether it is OK to follow such an approach? For this whether tools\fw_env.c is the right option? regards -Nitin Get your preferred Email name! Now you can @ymail.com and @rocketmail.com. http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
[U-Boot] Saving environment variables in MMC
Hi! I want to save and retrieve environment variables from a file in MMC. Can I get some pointers towards this? Whether env_relocate_spec() and other such functions, has some implementation for MMC also? regards -Nitin Get your preferred Email name! Now you can @ymail.com and @rocketmail.com. http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] bootcounter implementation for OMAP3
Hello,
--- On Tue, 9/3/10, Detlev Zundel d...@denx.de wrote:
From: Detlev Zundel d...@denx.de
Subject: Re: [U-Boot] bootcounter implementation for OMAP3
To: nitin...@yahoo.com
Cc: u-boot@lists.denx.de
Date: Tuesday, 9 March, 2010, 2:03 PM
Hi Nitin,
I am trying to implement the bootcount_store and
bootcount_load
methods for the OMAP3503 processor based board which I
am using.
For this I decided to use the location at the end of
scratchpad RAM,
that is I am trying to write at location 0x480029BF.
The code looks like
this, but the boot loader hags when it encounters
bootcount_load.
#ifdef CONFIG_BOOTCOUNT_LIMIT
void bootcount_store(ulong a)
{
volatile ulong *save_addr =
(volatile ulong
*)(0x480029BF);
*save_addr = (BOOTCOUNT_MAGIC
0x) | (a 0x);
You are writing a 32 bit entity to an non 32-bit aligned
address.
Although I do not know the omap too well, this can be a
problem on any
architecture.
Can you write 32-bot to that exact address from within the
U-Boot
commandline with e.g. mm?
That was the basic mistake I think. I was trying to write to a non 32 bit
aligned address. This got solved, but I have some new errors saying this
## Error: environment overflow, stdin deleted
## Error: environment overflow, stdout deleted
## Error: environment overflow, stderr deleted
## Error: environment overflow, bootcount deleted
Does that mean the size allocated for env is smaller compared to the actual
contents in env file.
I am new to u-boot. Can you give some pointers on this?
regards
-Nitin
Cheers
Detlev
--
Q: What do you get when you cross an elephant and a
banana?
A: |elephant| * |banana| * sin(theta)
--
DENX Software Engineering GmbH, MD:
Wolfgang Denk Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194
Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email:
d...@denx.de
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Re: [U-Boot] bootcounter implementation for OMAP3
Hello, --- On Tue, 9/3/10, Detlev Zundel d...@denx.de wrote: From: Detlev Zundel d...@denx.de Subject: Re: [U-Boot] bootcounter implementation for OMAP3 To: nitin...@yahoo.com Cc: u-boot@lists.denx.de Date: Tuesday, 9 March, 2010, 10:52 PM Hi Nitin, You are writing a 32 bit entity to an non 32-bit aligned address. Although I do not know the omap too well, this can be a problem on any architecture. Can you write 32-bot to that exact address from within the U-Boot commandline with e.g. mm? That was the basic mistake I think. I was trying to write to a non 32 bit aligned address. This got solved, but I have some new errors saying this Ok, thanks for the confirmation. ## Error: environment overflow, stdin deleted ## Error: environment overflow, stdout deleted ## Error: environment overflow, stderr deleted ## Error: environment overflow, bootcount deleted [...@pollux u-boot-testing (master)]$ git grep environment overflow common/cmd_nvedit.c: printf (## Error: environment overflow, \%s\ deleted\n, name); tools/env/fw_env.c: Error: environment overflow, \%s\ deleted\n, Does that mean the size allocated for env is smaller compared to the actual contents in env file. I am new to u-boot. Can you give some pointers on this? I just increased the size in my board specific configuration file. Now this feature of bootlimit and altbootcmd works for me on OMAP3. Thanks for your time. I was just wondering how to recover from errors such as bad CRC on uImage, where boot loader is not able to start booting the kernel for any reason. In such case how to fallback to a different kernel. -Nitin Only you can answer what you have defined for your configuration. Cheers Detlev -- He who can properly define and divide is to be considered a god. -- Plato -- DENX Software Engineering GmbH, MD: Wolfgang Denk Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de New Email names for you! Get the Email name you#39;ve always wanted on the new @ymail and @rocketmail. Hurry before someone else does! http://mail.promotions.yahoo.com/newdomains/aa/ ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
[U-Boot] bootcounter implementation for OMAP3
Hello,
I am trying to implement the bootcount_store and bootcount_load
methods for the OMAP3503 processor based board which I am using.
For this I decided to use the location at the end of scratchpad RAM,
that is I am trying to write at location 0x480029BF. The code looks like
this, but the boot loader hags when it encounters bootcount_load.
#ifdef CONFIG_BOOTCOUNT_LIMIT
void bootcount_store(ulong a)
{
volatile ulong *save_addr =
(volatile ulong *)(0x480029BF);
*save_addr = (BOOTCOUNT_MAGIC 0x) | (a 0x);
}
ulong bootcount_load(void)
{
volatile ulong *save_addr = (volatile ulong *)(0x480029BF);
if ((*save_addr 0x) != (BOOTCOUNT_MAGIC 0x))
return 0;
else
return (*save_addr 0x);
}
#endif /* CONFIG_BOOTCOUNT_LIMIT */
Am I doing some thing wring fundamentally? Can I get some pointers towrads this?
Also this code I have put in cpu/arm_cortexa8/cpu.c. Is there a way I can put
these functions in OMAP3 specific code and still have them called?
regards
-Nitin
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