Re: [PATCH v2 8/9] ARM: rockchip: pass device tree to TF-A

[Marco Felsch <m.felsch@pengutronix.de>]

On 25-05-28, Michael Tretter wrote:
> The upstream OP-TEE expects a device tree to be able to initialize the
> dynamic shared memory. Therefore, barebox should pass a device tree that
> contains memory nodes through the TF-A to OP-TEE.
> 
> OP-TEE may modify the passed fdt. Thus, barebox copies the fdt from the
> fixed size rodata area to the rk_scratch area and allocates a
> configurable memory area for the fdt to allow fdt modification.
> 
> OP-TEE has the CFG_DTB_MAX_SIZE config option for the maximum size of
> the fdt. barebox must reserve at least that much memory for the fdt to
> avoid out of bounds accesses from OP-TEE.
> 
> Unfortunately, the downstream TF-A fails to start if barebox passes its
> device tree and it is not possible to detect if the loaded TF-A is able
> to handle the device tree. Add a config option to pass the device tree
> if it is possible.
> 
> Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>

Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>