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. By the way, do you have any suggestion about my second issue? When Linux in the Dom0 tries to access UFS, CPU gets a secure interrupt and hangs in TZ. I had the same exactly behavior when I tried to access EMAC without enabling clocks and power domains in U-Boot. But Linux should enable all prerequisites for UFS... I suspect that there is an additional initialization needs to be done, but I didn't figured it yet. -- WBR, Volodymyr
