[PATCH 1/4] lib: optee: Avoid CONFIG_TZDRAM_* in optee_verify_bootm_image()

[Tom Rini]

On Tue, Sep 07, 2021 at 12:07:06PM -0500, Alexandru Gagniuc wrote:

> The configs TZDRAM_BASE and TZDRAM_SIZE are expected to describe the
> memory allocated to the OPTEE region. according to according to commit
> c5a6e8bd00cc ("optee: Add optee_verify_bootm_image()"). The TZDRAM is
> with some limitations, described by "/reserved-memory" nodes in the
> devicetree.
> 
> Consequently TZDRAM_BASE and TZDRAM_SIZE can point to imaginary
> regions which have nothing to do with actual DRAM. They are not used
> to configure the hardware or set up the Trust Zone Controller (TZC)
> for OP-TEE -- the devicetree values are used instead.
> 
> When a valid OP-TEE image does not fall within the region described by
> these configs, u-boot will refuse to load it. In fact, it mostly
> serves to cause "bootm" to reject perfectly good OP-TEE images.
> 
> Ironically, someone has to correctly configure the devicetree for
> TZDRAM, then go back and enter the same information in Kconfig for
> "bootm". To remedy this, do not use TZDRAM_BASE and TZDRAM_SIZE in the
> verification of OPTEE images.
> 
> Signed-off-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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