[U-Boot] [linux-sunxi] [RFC PATCH 0/3] sunxi: extend SPL header to propagate DRAM size

[Icenowy Zheng]

在 2018-05-17四的 09:16 +0100，Andre Przywara写道：
> This series tries to solve three issues we currently have on
> Allwinner boards:
> - The DRAM sizing routine can only cope with power-of-two sized DRAM.
> - The DRAM sizing routine steps through all DRAM, possibly hitting
> secure
>   memory.
> - The SPL header versioning is quite strict and tends to break every
> time
>   we need to update it.
> 
> So I thought about introducing something along the lines of semantic
> versioning[1], where we can add backwards-compatible changes to the
> SPL
> header without breaking every tool. This is introduced in the first
> patch.
> The second patch does some refactoring, so that the third patch can
> use
> the newly gained freedom to store the DRAM size. The SPL knows the
> DRAM
> size very well, so we store this in the SPL header, so that U-Boot
> proper
> can pick it up from there. This saves the call to get_ram_size() with
> its deficiencies.
> More information in the respective commit messages.
> 
> I understand that this versioning solution is not fully future-proof, 
> but
> we have only one byte for the version, and I just wanted to start
> discussion on this.
> There is a corresponding patch for sunxi-tools as well I am posting
> shortly.
> 
> [1] https://semver.org

Could I do some small reworks on this patchset and resend it?

We're now facing 3GiB Pine H64 releasing very soon.

> 
> Cheers,
> Andre.
> 
> Andre Przywara (3):
>   sunxi: Extend SPL header versioning
>   sunxi: board.c: refactor SPL header checks
>   sunxi: store DRAM size in SPL header
> 
>  arch/arm/include/asm/arch-sunxi/spl.h | 22 ++++++++----
>  board/sunxi/board.c                   | 66
> ++++++++++++++++++++++++++++-------
>  2 files changed, 70 insertions(+), 18 deletions(-)
> 
> -- 
> 2.14.1
>