MMC1 booting

Hi,

Please do a "print" while in U-Boot and copy the default environment here.

Best regards,
Miroslav

Hi Miroslav,

Following is the print env from U-boot:

U-Boot# printenv
arch=arm
baudrate=115200
board=am335x
bootargs=console=ttyO0,115200n8 root=ubi0:rootfs rw ubi.mtd=7,2048 rootfstype=ubifs rootwait=1
bootargs_defaults=setenv bootargs console=${console} ${optargs}
bootcmd=mmc dev ${mmcdev}; if mmc rescan; then echo SD/MMC found on device ${mmcdev};if run loadbootenv; then echo Loaded environment from ${bootenv};run importbooten;
bootdelay=0
bootenv=uEnv.txt
bootfile=uImage
console=ttyO0,115200n8
cpu=armv7
dfu_alt_info_emmc=rawemmc mmc 0 3751936
dfu_alt_info_mmc=boot part 0 1;rootfs part 0 2;MLO fat 0 1;MLO.raw mmc 100 100;u-boot.img.raw mmc 300 3C0;u-boot.img fat 0 1;uEnv.txt fat 0 1
dfu_alt_info_nand=SPL part 0 1;SPL.backup1 part 0 2;SPL.backup2 part 0 3;SPL.backup3 part 0 4;u-boot part 0 5;kernel part 0 7;rootfs part 0 8
ethact=cpsw
ethaddr=c4:ed:ba:80:01:db
fdt_high=0xffffffff
fdtaddr=0x80F80000
findfdt=if test $board_name = A335BONE; then setenv fdtfile am335x-bone.dtb; fi; if test $board_name = A33515BB; then setenv fdtfile am335x-evm.dtb; fi; if test $boari
importbootenv=echo Importing environment from mmc ...; env import -t $loadaddr $filesize
ip_method=none
kloadaddr=0x80007fc0
loadaddr=0x80200000
loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}
loadramdisk=fatload mmc ${mmcdev} ${rdaddr} ramdisk.gz
loaduimage=ext2load mmc ${mmcdev}:2 ${kloadaddr} /boot/${bootfile}
loaduimagefat=fatload mmc ${mmcdev} ${kloadaddr} ${bootfile}
mmcargs=run bootargs_defaults;setenv bootargs ${bootargs} root=${mmcroot} rootfstype=${mmcrootfstype} ip=${ip_method}
mmcboot=echo Booting from mmc ...; run mmcargs; bootm ${kloadaddr}
mmcdev=0
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=ext3 rootwait
mtdids=nand0=omap2-nand.0
mtdparts=mtdparts=omap2-nand.0:128k(SPL),128k(SPL.backup1),128k(SPL.backup2),128k(SPL.backup3),1920k(u-boot),128k(u-boot-env),5m(kernel),-(rootfs)
nandargs=setenv bootargs console=${console} ${optargs} root=${nandroot} rootfstype=${nandrootfstype}
nandboot=echo Booting from nand ...; run nandargs; nand read ${loadaddr} ${nandsrcaddr} ${nandimgsize}; bootm ${loadaddr}
nandimgsize=0x500000
nandroot=ubi0:rootfs rw ubi.mtd=7,2048
nandrootfstype=ubifs rootwait=1
nandsrcaddr=0x280000
netargs=setenv bootargs console=${console} ${optargs} root=/dev/nfs nfsroot=${serverip}:${rootpath},${nfsopts} rw ip=dhcp
netboot=echo Booting from network ...; setenv autoload no; dhcp; tftp ${loadaddr} ${bootfile}; run netargs; bootm ${loadaddr}
nfsopts=nolock
ramargs=setenv bootargs console=${console} ${optargs} root=${ramroot} rootfstype=${ramrootfstype}
ramboot=echo Booting from ramdisk ...; run ramargs; bootm ${loadaddr}
ramroot=/dev/ram0 rw ramdisk_size=65536 initrd=${rdaddr},64M
ramrootfstype=ext2
rdaddr=0x81000000
rootpath=/export/rootfs
soc=am33xx
spiargs=setenv bootargs console=${console} ${optargs} root=${spiroot} rootfstype=${spirootfstype}
spiboot=echo Booting from spi ...; run spiargs; sf probe ${spibusno}:0; sf read ${loadaddr} ${spisrcaddr} ${spiimgsize}; bootm ${loadaddr}
spibusno=0
spiimgsize=0x362000
spiroot=/dev/mtdblock4 rw
spirootfstype=jffs2
spisrcaddr=0xe0000
static_ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off
stderr=serial
stdin=serial
stdout=serial
usbnet_devaddr=c4:ed:ba:80:01:db
vendor=ti
ver=U-Boot 2013.01.01 (May 15 2013 - 14:38:05)

Environment size: 3651/131068 bytes

Thanks,

Rajeev

Hi Rajeev,

To me this seems like a flaw in the default U-Boot environment. As I see it, the default environment has the "mmcdev" variable set to device 0 with no ability to check if the device is actually mmc1.

The "bootcmd" checks if mmc0 is available and if it is not, it then continues with NAND boot. What I can suggest is to modify the default U-Boot environment to first check MMC0 and then MMC1. You will need to recompile your U-Boot after you do this.

The default environment is located inside <u-boot_folder>/include/configs/am335x_evm.h

I believe the changes are only for the "bootcmd". It should look something like this (although a bit hacky):

#ifndef CONFIG_RESTORE_FLASH
#define CONFIG_BOOTCOMMAND \
    "mmc dev ${mmcdev}; " \
    "if mmc rescan; then " \
        "echo SD/MMC found on device ${mmcdev};" \
        "if run loadbootenv; then " \
            "echo Loaded environment from ${bootenv};" \
            "run importbootenv;" \
        "fi;" \
        "if test -n $uenvcmd; then " \
            "echo Running uenvcmd ...;" \
            "run uenvcmd;" \
        "fi;" \
        "if run loaduimagefat; then " \
            "run mmcboot;" \
        "elif run loaduimage; then " \
            "run mmcboot;" \
        "else " \
            "echo Could not find ${bootfile} ;" \
        "fi;" \
    "else " \
        "if ${mmcdev}; then " \
            "setenv mmcdev 0; " \
        "else " \
            "setenv mmcdev 1; " \
        "fi; " \
        "mmc dev ${mmcdev}; " \
        "if mmc rescan; then " \
            "echo SD/MMC found on device ${mmcdev};" \
            "if run loadbootenv; then " \
                "echo Loaded environment from ${bootenv};" \
                "run importbootenv;" \
            "fi;" \
            "if test -n $uenvcmd; then " \
                "echo Running uenvcmd ...;" \
                "run uenvcmd;" \
            "fi;" \
            "if run loaduimagefat; then " \
                "run mmcboot;" \
            "elif run loaduimage; then " \
                "run mmcboot;" \
            "else " \
                "echo Could not find ${bootfile} ;" \
            "fi;" \
        "else " \
            "run nandboot;" \
        "fi; " \
    "fi;" \

Best regards,
Miroslav

Hi Miroslav,

What you suggested is correct, but i am unable to find out how to change mmc0 to mmc1

I had done the following in u-boot, still did not get desired result

#define CONFIG_EXTRA_ENV_SETTINGS \
        "loadaddr=0x80200000\0" \
        "kloadaddr=0x80007fc0\0" \
        "fdtaddr=0x80F80000\0" \

        "mtdparts=" MTDPARTS_DEFAULT "\0" \
        "dfu_alt_info_mmc=" DFU_ALT_INFO_MMC "\0" \
        "dfu_alt_info_emmc=rawemmc mmc 0 3751936\0" \
        "dfu_alt_info_nand=" DFU_ALT_INFO_NAND "\0" \
        "mmcdev=1\0" \                              //this is     "mmcdev=0\0" \   
        "mmcroot=/dev/mmcblk0p2 ro\0" \
        "mmcrootfstype=ext3 rootwait\0" \
        "nandroot=ubi0:rootfs rw ubi.mtd=7,2048\0" \
        "nandrootfstype=ubifs rootwait=1\0" \

Best regards

Rajeev battu

Hi,

What exactly is the log showing? Modifying only the mmcdev variable should work for your usecase, but you are limiting the ability to boot automatically from MMC0.

The modification I suggest (the CONFIG_BOOTCOMMAND variable) is pasted in my previous reply.

Best regards,
Miroslav

I have a similar problem with it in kernel,

As my U-Boot env passes env to kernel to mount mmcblk0p2 as my rootfs, it works fine without SD card inserted in.

When SD card is inserted, my mmcblk0p2 becomes -> mmcblk1p2, resulting kernel unable to mount the correct rootfs.

any solutions? or to fix the enumeration?