Embedded: OMAP3 EVM boot arguments

Question

I'm a beginner. I'm using OMAP3 EVM. Currently, I'm able to boot via NFS. But, I want it to be from SD card. I removed the boot.scr file while changing it to SD boot. It was booting properly. But, after the line 'Uncompressing Linux...' it waits for some time and then file system gets loaded directly and asks for login. The so many lines of initialization logs which used to come after the line 'Uncompressing Linux...' are completely missing. But, the root file system is fully loaded and I'm able to use it as I did previously. So, I tried making the boot.scr file by removing the nfs related arguments alone.

The boot.scr commands previously,

setenv bootargs 'mem=128M console=ttyS0,115200n8 noinitrd rw rootfstype=ext3 ip=dhcp root=/dev/nfs nfsroot=192.168.15.3:/home/mistral/nfsroot,nolock'
setenv bootcmd 'mmc init; fatload mmc 0 0x80000000 uImage; bootm 0x80000000'
fatload mmc 0 0x80000000 uImage
bootm 0x80000000

The boot.scr commands now,

setenv bootcmd 'mmc init; fatload mmc 0 0x80000000 uImage; bootm 0x80000000'
fatload mmc 0 0x80000000 uImage
bootm 0x80000000

I haven't modified the uEnv.txt. It's contents are,

bootargs=console=ttyS0,115200n8 mem=256M root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait init=/linuxrc ip=off
bootcmd=mmc rescan ; fatload mmc 0 81000000 uImage ; bootm 81000000
uenvcmd=bootd

Now, it has completely stopped booting after the line 'Uncompressing Linux...'. Please guide me in where I'm going wrong.

Answer 1

The /dev/ttyS0 that you set in minicom is the serial port on your PC and NOT the OMAP EVM board.

Refer to the original bootargs or release-notes of user-guide to determine the proper value of the console variable for your EVM board and BSP release.

In addition to specifying the proper console= option,

• pass the earlyprintk param
• do NOT pass the silent param

on the kernel cmd-line (bootargs).