[Skiboot] skiboot LID > 1MB, "larger than partition"

[Vasant Hegde]

On 10/27/2016 09:13 AM, Stewart Smith wrote:
> Hey all,
>
> so, with (most) toolchains and recent skiboot development, we're beyond
> the one *megabyte* (1MB) size for skiboot.lid. If you're flashing
> skiboot.lid on an FSP system, you won't care as we have to get to 16MB
> for there to be a problem.
>
> However, if you're flashing on an OpenPOWER system, you may have an
> issue. Why? The PAYLOAD partition is only 1MB.
>
> When you flash, you may get this warning from pflash:
> WARNING: Size (1066432 bytes) larger than partition (1048576 bytes), cropping to fit

Thanks for the info.

>
> It'll probably still boot, so one may want to question the value of
> those last few thousand bytes :)
>
> Luckily, back in May, code hit Hostboot to load an XZ compressed PAYLOAD
> (which it detects by looking for the magic number). So, this is why for
> 5+ months we also produce skiboot.lid.xz.
>
> For a system with remotely recent hostboot, just flash skiboot.lid.xz
> rather than skiboot.lid and it'll all "just work" (and it'll boot a tiny
> bit faster).

I know we can blindly flash .xz image on recent op-build. But is there a way to 
validate whether its safe to flash .xz or not ?

>
> Might be time to revisit CONFIG_ options? I've kind of enjoyed having no
> knobs to fiddle though...
>

Yep. May be we can add CONFIG_* and disable FSP specific stuff from BMC build.


-Vasant