AM335x with ubifs support

Sreenivas Kowtharapu

Hi,

I have compiled u-boot in AM335x SDK-7 and i have flashed MLO, u-boot.img and u-boot.spl.bin files in NAND flash as

nand erase.chip

fatload mmc 0 0x81000000 MLO

nand write 0x81000000 0x0 0x80000

fatload mmc 0 0x81000000 u-boot-spl.bin

nand write 0x81000000 0x80000 0x40000

fatload mmc 0 0x81000000 u-boot.img

nand write 0x81000000 0xc0000 0x100000

fatload mmc 0 0x81000000 uImage

nand write 0x81000000 0x00a00000 0x500000

And i have able to boot kernel, but the problem is its trying to boot root file system from the mmc/sd card, i have tried to set the boot args as below but its again trying to boot from mmc/sd card.

setenv bootargs 'console=ttyO0,115200n8 noinitrd ip=off mem=128M rootdelay=5 rw ubi.mtd=7,2048 rootfstype=ubifs root=ubi0:rootfs'

The u-boot SPL is directly booting the kernel, can any one please tell how to set env variable and where i have to set these variables.

over 11 years ago

0 Miroslav Kiradzhiyski XID over 11 years ago

TI__Mastermind 25235 points

Hi,

The built-in environment variables reside inside <u-boot_dir>/include/configs/am335x_evm.h under the following name:

#define CONFIG_EXTRA_ENV_SETTINGS

I assume this is what you want to modify.

Best regards,
Miroslav

0 Sreenivas Kowtharapu over 11 years ago in reply to Miroslav Kiradzhiyski XID

Expert 1165 points

Hi,

Thanks for the reply,

I have verified the file what you have said but, in the previous versions of u-boot we need to specify the boot device as

#define CONFIG_NAND_BOOT, but here there is no definition like that, and by default its booting through MMC/SD card, how this happening, and if i want to boot through NAND flash please let me know what and how the env variables are added to this file. i have attached my configuration file0842.am335x_evm.h

0 Sreenivas Kowtharapu over 11 years ago in reply to Sreenivas Kowtharapu

Expert 1165 points

Hi,

I have able to modify the default env of u-boot, latest versions of u-boot uses multiple files for the env variables instead of single file, for AM335x EVM the total env variables are placed in three files "am335x_evm.h" , "ti_am335x_common.h" and "ti_armv7_common.h" files are in /include/configs directory.

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AM335x with ubifs support