do't boot from MMC/SD

yi luo68719

Other Parts Discussed in Thread: AM1707

i use AM1707 EVM,when i load u-boot, kernel into spi flash,then boot by SPI Flash mode,but the ramdisk in MMC/SD never booting.

when i load the kernel and ramdisk into SDRAM ,boot success.

how can i boot the ramdisk in mmc/sd with spi_flash mode?

please help me,thanks!

this is my type steps:

u-boot>sf probe 0

u-boot>tftp 0xc0700000 uImage

u-boot>sf erase 0x1E0000 0x220000

u-boot>sf write 0xc0700000 0x1E0000 0x220000

u-boot>setenv bootargs 'mem=32M console=ttyS2,115200n8 root=/dev/ram0 rw initrd=0xc1180000,4M ip=192.168.0.125'

u-boot>setenv bootcmd 'sf probe 0;sf read 0xc0700000 0x1E0000 0x220000; bootm 0xc0700000'

this is the problem:

0 Gururaja Hebbar over 14 years ago

Hi,

There are 2 ways to boot linux with ramdisk on mmc/sd.

1. Copy ramdisk from mmc/sd to ram and then boot linux

a. Initialize mmc./sd (mmc init in u-boot). load the ramdisk from mmc/sd to ram. boot linux normally

2. boot linux directly with ramdisk in mmc/sd

a. In order to boot Linux with ramdisk on mmc/sd, the console argument to linux kernel needs to be changed.

change the root= argument from

root=/dev/ram0

root=/dev/mmcblk0p1

b. for example look here ---> http://code.google.com/p/beagleboard/wiki/BootingBeagleBoard for this, mmc card needs to be formated in ext2 filesystem.

regards

Gururaja

0 yi luo68719 over 14 years ago in reply to Gururaja Hebbar

thanks you ! you answer is very good,my questions has been done.

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