[U-Boot] changing bootcmd environment

[Scott Wood]

On 02/04/2013 10:54:52 PM, Ratheendran R wrote:
> Dear All,
> 
> I am using u-boot given by our Samsung based s3c2416 board vendor  
> which
> support SD CARD based boot,I am trying to change the boot command  
> variable
> adding few more steps to it from the serial console. The problem  is  
> I am
> not able to add all the steps to the bootcmd variable into the
> environment,it is truncated midway.so can any one share your valuable
> experience in fixing this issue.
> 
> I am trying the below command..
> 
> setenv bootcmd "sleep 1;nand scrub ;sleep 1;nand erase;sleep 1;movi  
> read
> 3800000# 40000 c0000000 ;sleep 1;nand write c0000000 0 40000;sleep  
> 1;movi
> read kernel c0000000;sleep 1;nand write c0000000 40000 200000;sleep  
> 1;movi
> read 3600000# 3800000 c0000000 ;sleep 1; nand write.yaffs c0000000  
> 400000
> 35db4c0; sleep1; movi read 3600000# 3800000 c0000000; nand write.yaffs
> c0000000 6000000 35db4c0"

Using "nand scrub" in this manner is totally wrong.  Even without  
scrubbing, erasing and rewriting NAND on each boot is not a good idea.

It also indicates you're using an old U-Boot, as for a while now  
full-chip erase commands have to be written as "nand erase.chip".  Plus  
I don't see a "movi" command in mainline U-Boot.  Maybe you should be  
asking your board vendor for support?

Why do you need all those sleep commands?  You could shorten your  
bootcmd quite a bit by removing them...

-Scott