[U-Boot] [PATCH v2] sbc8548: document how to write main flash from alternate flash

[York Sun <yorksun@freescale.com>]

On 03/16/2015 12:53 PM, Paul Gortmaker wrote:
> If you are running on the alternate flash in order to fix a
> corrupted main flash image, it might be good to have the steps
> for that documented as well.
> 
> Also delete any protect commands from non-active flash banks;
> they are only required for the instances where you are writing
> to the currently in use flash image.
> 
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> ---
> 
> [v2: drop protect commands from instances where we flash the non
>      active flash bank ; it wasn't protected anyway.]
> 
>  board/sbc8548/README | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/board/sbc8548/README b/board/sbc8548/README
> index feac5e3e63e5..92731645f266 100644
> --- a/board/sbc8548/README
> +++ b/board/sbc8548/README
> @@ -132,11 +132,19 @@ image in the SODIMM that is built with CONFIG_SYS_ALT_BOOT enabled,
>  
>  	tftp u-boot.bin
>  	md 200000 10
> -	protect off all
>  	era eff00000 efffffff
>  	cp.b 200000 eff00000 100000
>  	md eff00000 10
> -	protect on all
> +
> +If you are running the alternate 64MB /CS0 settings and want to update
> +the "normal" default 8MB u-boot image, then (built with CONFIG_SYS_ALT_BOOT
> +disabled) the steps will become:
> +
> +	tftp u-boot.bin
> +	md 200000 10
> +	erase effa0000 efffffff
> +	cp.b 200000 effa0000 60000
> +	md effa0000 10
>  
>  Finally, if you are running the alternate 64MB /CS0 settings and want
>  to update the in-use u-boot image, then (again with CONFIG_SYS_ALT_BOOT
> 

Paul,

Sorry I didn't catch this in previous version. In your instruction, you presume
the tftp location is 0x200000, which may not be the case. I suggest you add
specific location in tftp command so it is clear.

I also noticed the file size seems different in your README, comparing with the
section above. It may be worth to double check.

York