> > Hi Hannes, Hi, > > 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 ? yes - i think so. please have a look to env_mmc.c, lines 65 to 120 may be the most interesting for you. There are only low-level operations performed, nobody doesn't care about any filesystem or "filesystems-partitiontable" at this time.
> > Pls also keep in mind that from linux, it works fine, with > fw_env.config set to > /dev/mmcblk0p4 0 0x10000 i think this environment is its own instance and has no interaction with u-boot`s one, is that so? In fact this environment is within "User-Area" of eMMC and at the place were part #4 starts. best regards, hannes > > 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 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
