PRAM and reserved memory for Linux

[Tom Rini]

On Wed, Jul 13, 2022 at 10:08:38AM +0000, Joakim Tjernlund wrote:

> I added CONFIG_PRAM 4 and a reserved-memory DTS node for the same space but
> now u-boot complains when booting:
>   ERROR: reserving fdt memory region failed (addr=703ff000 size=1000)
> The error is caused by arch_lmb_reserve() in arm which seem
> to reserve command line and board info ? 
> 
> If I remove the reserved-memory DTS node I don't get a reserved area in Linux,
> don't quite understand how PRAM is supposed to work?

The first likely problem is that CONFIG_PRAM stuff isn't often used
these days so might be glitchy / buggy, as you've found here.  Next, I
bet that area in arch_lmb_reserve() is about ATAGS/related and should be
guarded with CONFIG_SUPPORT_PASSING_ATAGS.

-- 
Tom
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