On 3/4/24 16:51, Volodymyr Babchuk wrote:
Hi Stephan,
Stephan Gerhold <step...@gerhold.net> writes:
On Fri, Mar 01, 2024 at 06:25:39PM +0000, Volodymyr Babchuk wrote:
Caleb Connolly <caleb.conno...@linaro.org> writes:
On 29/02/2024 14:21, Volodymyr Babchuk wrote:
This patch series adds support for Qualcomm SA8155-ADP development
board. Main motivation for this series is to allow running
virtualization software on this board and U-Boot is a good way to
break Qualcomm's boot chain at EL2 with more convenient ways for
uploading and running the code. With this patches applied it is
possible to upload and run Xen on this board. KVM probably should work
too.
This is really cool! I've experimented with this on SDM845 and SM8250
but never really did anything with it... I'd love to take a look at your
Xen branch?
Honestly, there is nothing to look at right now. I just implemented
early printk serial driver for the qcom, made hacks to the device tree
and trying to boot Dom0. I already expecting issues with the GPU,
because it has own SMMU without virtualization support and Xen already
complains about it. So I had to remove it from the DTS for a time being.
Did you enable all the clocks/power domains/etc for the GPU SMMU? If I
remember correctly it is off by default and all registers read as
zeroes. The SMMU driver could easily get confused about the capabilities
of the SMMU (e.g. the stage 2/virtualization support) if all the ID
registers read as zeroes.
Ah, this is a great idea, thanks. I tried a quick test by enabling only
clocks that are provided by GCC, but looks like I need to enable GPUCC
clocks as well. So I need to write a driver for GPUCC or at least
figure which registers to write with a debugger. I'll try this later.
You'll probably also need to enable the CX GDSC (not sure about the
order, probably GDSC and then clocks)
Konrad
