On 01/03/2024 18:25, Volodymyr Babchuk wrote:
Hi Caleb,
Caleb Connolly caleb.connolly@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.
Hmm, I see. You'll also definitely start running into issues with the DSPs and probably anything else that loads firmware. Qualcomm's hypervisor seems to be involved in booting a lot of the peripherals. The sc7180 Chromebook support is probably a good reference for how to do this in Linux as they also run in EL2.
Anyways, right now my Dom0 does not want to boot due to some issues with UFS. I suspect that some power domain or clock is disabled or some other bit of initialization is missing in the mainline Linux. And reason why bare Linux kernel have no issues with UFS is because aboot/xbl does proper UFS initialization, while in my case I am skipping the android bootloader completely...
Oh that's always fun...
I'll publish my work when I'll get Dom0 running.
For sure, I'd love to try it out!
It's really exciting to know you're working on this :D