[U-Boot] FSL PowerPC platform: Not able to boot Linux with ramdisk size > 100MB

[Scott Wood]

On 10/27/2016 04:27 AM, Prabhakar Kushwaha wrote:
> Hi Masahiro,
> 
> I am not able to boot Linux onF PowerPC platform with ramdisk size > 100MB. 
> I tried u-boot master with top commit as " 5ac5861c4ba851b473e6a24940b412b397627d8d ".
> 
> I tried git-bisect and figured out below patch causing this problem. If I revert this patch, Linux boots properly.  
> 
> commit 20e072f37402c17741f67d9693eaabdd835b80f2
> Author: Masahiro Yamada <yamada.masahiro at socionext.com>
> Date:   Thu Dec 17 17:19:35 2015 +0900
> 
>     image: check "bootm_low" and "bootm_size" if "initrd_high" is missing
>     
>     To boot Linux, we should prevent Initramdisk and FDT from going too
>     high.
>     
>     Currently, boot_relocate_fdt() checks "fdt_high" environment first,
>     and then falls back to getenv_bootm_mapsize() + getenv_bootm_low()
>     if "fdt_high" is missing.
>     
>     On the other hand, boot_ramdisk_high() only checks "initrd_high" to
>     get the address limit for the Initramdisk.  We also want to let this
>     case fall back to getenv_bootm_mapsize() + getenv_bootm_low().
>     
>     Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> 
> Please advise!!

On PPC the initrd does not need to be loaded within the boot mapping.
This assumption of what the absence of initrd_high means is not
universally appropriate.  Why not just set initrd_high on the platforms
that need it?

-Scott