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Unable to read uEnv.txt from eMMC nand

Srinidhi S
Intellectual 875 points
Other Parts Discussed in Thread: AM5728

Hello,

We are trying to boot from eMMC nand flash memory on a board based on AM5728. And the SDK we are presently using is ti-processor-sdk-linux-am57xx-evm-02.00.01.07. We followed the exact steps from the link  

U-boot by default looks for root file system in mmc 0:2 which is the SD card partition. So, to change it to eMMC nand, which is mmc 1:2, i need to change the argument "finduuid". To achieve this, am including the line  "finduuid=part uuid mmc 1:2 uuid" in my uEnv.txt. But unfortunately, while booting from NAND, this file is not read at all! Am using the same MLO and u-boot.img files in the NAND which i always use to boot from SD card. Same files while booting from SD card reads uEnv.txt. I have just copy pasted these two files from SD card to eMMC NAND memory. FYI, my partition table looks like this:

/dev/mmcblk1p1 * 2048 133119 131072 64M 6 FAT16
/dev/mmcblk1p2 133120 7553023 7419904 3.6G 83 Linux

And, am able to boot from Nand by giving the following command from u-boot: setenv finduuid part uuid mmc 1:2 uuid. I just want this one line to be read from uEnv.txt.

Best regards,

Sri

  • 0
    TI__Guru**** 161600 points

    Hi,

    Can you share your environment settings defined in include/configs/ti_armv7_common.h, the bellow part:

       #define DEFAULT_MMC_TI_ARGS \

                "mmcdev=0\0" \

                "mmcrootfstype=ext4 rootwait\0" \

                "finduuid=part uuid mmc 0:2 uuid\0" \

               "args_mmc=run finduuid;setenv bootargs console=${console} " \

               "${optargs} " \

              "root=PARTUUID=${uuid} rw " \

              "rootfstype=${mmcrootfstype}\0" \

             "loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \

             "bootscript=echo Running bootscript from mmc${mmcdev} ...; " \

            "source ${loadaddr}\0" \

             "bootenvfile=uEnv.txt\0" \

            "importbootenv=echo Importing environment from mmc${mmcdev} ...; " \

                      "env import -t ${loadaddr} ${filesize}\0" \

            "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenvfile}\0" \

               "envboot=mmc dev ${mmcdev}; " \

              "if mmc rescan; then " \

                      "echo SD/MMC found on device ${mmcdev};" \

               "if run loadbootscript; then " \

                      "run bootscript;" \

               "else " \

                    "if run loadbootenv; then " \

                            "echo Loaded env from ${bootenvfile};" \

                            "run importbootenv;" \

                  "fi;" \

                "if test -n $uenvcmd; then " \

                       "echo Running uenvcmd ...;" \

                          "run uenvcmd;" \

                "fi;" \

            "fi;" \

    "fi;\0" \

    Also have a look at the following guide for additional info:

     processors.wiki.ti.com/.../AM335x_U-Boot_User's_Guide

    Best Regards,

    Yordan

  • 0 in reply to Yordan Kovachev
    Intellectual 875 points

    #define DEFAULT_MMC_TI_ARGS \

       "mmcdev=0\0" \

       "mmcrootfstype=ext4 rootwait\0" \

       "finduuid=part uuid mmc 0:2 uuid\0" \

       "args_mmc=run finduuid;setenv bootargs console=${console} " \

           "${optargs} " \

           "root=PARTUUID=${uuid} rw " \

           "rootfstype=${mmcrootfstype}\0" \

       "loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \

       "bootscript=echo Running bootscript from mmc${mmcdev} ...; " \

           "source ${loadaddr}\0" \

       "bootenvfile=uEnv.txt\0" \

       "importbootenv=echo Importing environment from mmc${mmcdev} ...; " \

           "env import -t ${loadaddr} ${filesize}\0" \

       "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenvfile}\0" \

       "envboot=mmc dev ${mmcdev}; " \

           "if mmc rescan; then " \

               "echo SD/MMC found on device ${mmcdev};" \

               "if run loadbootscript; then " \

                   "run bootscript;" \

               "else " \

                   "if run loadbootenv; then " \

                       "echo Loaded env from ${bootenvfile};" \

                       "run importbootenv;" \

                   "fi;" \

                   "if test -n $uenvcmd; then " \

                       "echo Running uenvcmd ...;" \

                       "run uenvcmd;" \

                   "fi;" \

               "fi;" \

           "fi;\0" \

    As of now, we have modified the above line to "finduuid=part uuid mmc 1:2 uuid"  to boot from eMMC nand. But i know that's not the correct way. I should be able to read from uEnv.txt.

     

     

    Best Regards,

    Sri

  • 0 in reply to Srinidhi S
    Intellectual 875 points
    Any leads?


    Thanks and Regards,
    Srinidhi S.
  • 0 in reply to Srinidhi S
    TI__Guru**** 161600 points
    Hi,

    Try changing "mmcdev=0\0" \ to "mmcdev=1\0" \ and see if u-boot is able to read uEnv.txt.

    Best Regards,
    Yordan