[PATCH v1] common/memsize.c: Fix get_ram_size() original data restore

[Tom Rini]

On Fri, Mar 14, 2025 at 11:06:49AM +0100, Stefan Eichenberger wrote:

> From: Stefan Eichenberger <stefan.eichenberger at toradex.com>
> 
> The get_ram_size() function fails to restore the original RAM data when
> the data cache is enabled. This issue was observed on an AM625 R5 SPL
> with 512MB of RAM and is a regression that became visible with
> commit bc07851897bd ("board: ti: Pull redundant DDR functions to a common
> location and Fixup DDR size when ECC is enabled").
> 
> Observed boot failure messages:
>   Warning: Did not detect image signing certificate. Skipping authentication to prevent boot failure. This will fail on Security Enforcing(HS-SE) devices
>   Authentication passed
>   Starting ATF on ARM64 core...
> 
> The system then hangs. This indicates that without a data cache flush,
> data in the cache is not coherent with RAM, preventing the system from
> booting. This was verified by printing the content of this address when
> the issue occurs.
> 
> Add a data cache flush after each restore operation to resolve this
> issue.
> 
> Fixes: bc07851897bd ("board: ti: Pull redundant DDR functions to a common location and Fixup DDR size when ECC is enabled")
> Fixes: 1c64b98c1ec4 ("common/memsize.c: Fix get_ram_size() when cache is enabled")
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger at toradex.com>
> ---
>  common/memsize.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

Ugh. Is there not a chance the problem being that we need a
dcache_flush_all() in the K3 ddr code somewhere? I'm just trying to see
how we got here and I notice now that yes, this does look like it
finishes what 1c64b98c1ec4 started but in hindsight was that showing
something else needing to be fixed?

-- 
Tom
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