HI Stephen, Yes, I do understand that its not a good idea at all to use hardcoded addresses like that, if you pls list some steps on how can I use the sw level partition. That be great.
From: Stephen Warren <swar...@wwwdotorg.org> To: Naitik Amin <naitik.a...@ametek.com>, u-boot@lists.denx.de, u-boot-requ...@lists.denx.de, Date: 09/03/2014 11:53 AM Subject: [Suspected Spam] Re: [U-Boot] uboot env in mmc partition On 08/29/2014 11:21 AM, Naitik Amin wrote: > HI there, > > I recently made changes to my system, where I created a new partition on > my mmc. (mmcblk0p4) > > Then i dd'd a uboot env image into this partition, updated the > fw_env.config to point to /dev/mmcblk0p4. At this point, my fw_printenv > and fw_setenv work good. So as a next step, I am tried to modify uboot to > make it point to my env image in my new partition. > > I made below changes to my config header and rebuilt the uboot. On doing > printenv from uboot, I dont see the same env that I pushed it from linux, > infact I see it as its defined in the config header. > > Can some one help ? > > /* environment setting for MMC */ > #ifdef CONFIG_ENV_IS_IN_MMC > #define CONFIG_SYS_MMC_ENV_DEV 0 /* device 0 */ > #define CONFIG_SYS_MMC_ENV_PART 4 > #define CONFIG_ENV_OFFSET 0 /* just after the MBR */ > #endif I think you're confusing eMMC HW-level partitions (0=user data or mmcblk0, 1=mmcblk0boot0, 2=mmcblk0boot1) and SW-level (MBR/GPT) partitions within the user data area; /dev/mmcblk0p4. CONFIG_SYS_MMC_ENV_PART applies to eMMC HW-level partitions. I don't know if there's an environment variable that selects which SW-level partition to use. This is the feature you're looking for! Later in the thread I saw: #define CONFIG_ENV_OFFSET 0x21900000 That's not a good idea, since if someone repartitions the disk, that offset will be incorrect. Better would be to use (or add) SW-level partition support in the MMC environment code.
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