Hi Hannes, Yes, its an eMMC. If I read your response correctly, #define CONFIG_SYS_MMC_ENV_PART Can only have 2 values, 1 & 2 is that correct ?
Pls also keep in mind that from linux, it works fine, with fw_env.config set to /dev/mmcblk0p4 0 0x10000 From: Hannes Petermaier <hannes.peterma...@br-automation.com> To: "Naitik Amin" <naitik.a...@ametek.com>, Cc: u-boot@lists.denx.de, u-boot-boun...@lists.denx.de Date: 09/01/2014 12:54 AM Subject: Re: [U-Boot] uboot env in mmc partition > HI there, Hi Naitik, > > I recently made changes to my system, where I created a new partition on > my mmc. (mmcblk0p4) do you use MMC or eMMC ? I guess eMMC. > > 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 understand this #defines as following: CONFIG_SYS_MMC_ENV_DEV says: use mmc-device #0 CONFIG_SYS_MMC_ENV_PART says: use partition #4 i know that u-boot is using the boot-partitions to store the environment, an emmc only has 2 partitions. So #4 is a an illegal paramater CONFIG_ENV_OFFSET is an absolute address within the device/partition so it is not "just after the MBR", instead the environment is "instead the MBR" best regards, Hannes
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