[U-Boot] [RFC][PATCH v4] bootm: Add sub commands (sequence of commands to replicate bootm)

[Kumar Gala]

> I applied your changeset and verified that the traditional bootm  
> syntax worked.  I then tried to figure out a working sequence of  
> bootm [a-z]+ commands and failed.
>  <http://www.denx.de/wiki/view/U-Boot/UBootFdtInfo#Sequence>
> * I didn't see any command for disabling interrupts
> * When I do the "bootm loados" command, my target (MPC8360EMDS)  
> reboots
>  * Could be because interrupts are not disabled but we overwrite the  
> exception vectors.
>  * Could be I'm doing something wrong.
> Do you have a boot script "use case" to illustrate a sequence that  
> works for you?

setenv bootm_low  00000000
setenv bootm_size 10000000
bootm start 0x1000000 0x1300000 0xf00000
interrupts off
bootm loados
bootm ramdisk
bootm fdt
fdt boardsetup
fdt chosen $initrd_start $initrd_end
bootm prep
bootm go

- k