Re:

[Thomas Turner]

Hi Sam and Alexey,

On 19/08/2026 20:51, Sam Protsenko wrote:
> Can you please tell us a bit about how you tested this patch, and on
> which board? As DPU is not currently enabled on Exynos850 SoC, I'm not
> sure how exactly GPU can be useful. If you have a use case or a
> testing procedure we can run on the E850-96 board, please share.

Sam, Alexey could you please test GPU on the E850-96 board by following
these instructions:

1) Apply this patch series locally
2) Change status="disabled"; to status="okay";
3) Make sure these configs are enabled:
CONFIG_DRM_SIMPLEDRM=y
CONFIG_DRM_PANFROST=y
4) In terms of regulators we set up a basic mali regulator via our
secondary bootloader [1] and configured with this dts setup [2], NOTE
you may be able to get away with a dummy regulator so try that first.
If not I am sure you can replicate something simple with u-boot PMIC.
5) Boot a GUI, I saw Debian was used for the bring-up, that should work
6) Run the following command:
$ dmesg | grep "panfrost"
7) Compare that to the output at [3]

I hope these instructions make sense, but feel free to send any queries
my way.

Best Regards,
Tom

[1] https://github.com/samsungexynos850/uniLoader/commit/6a2ed2d97aaf1616e581d0979f9e56a046093e15
[2] https://github.com/samsungexynos850/linux/commit/68442271304b7c7a410d85118e85df67bcda108a
[3] https://gist.github.com/DaemonMCR/63fa564483202642d6d66e628b8e6c90