Hi Tom, On Sun, 16 Feb 2025 at 14:57, Tom Rini <tr...@konsulko.com> wrote: > > On Sun, Feb 16, 2025 at 01:43:45PM -0700, Simon Glass wrote: > > > U-Boot can start and boot an OS in both qemu-x86 and qemu-x86_64 but it > > is not perfect. > > > > With both builds, executing the VESA ROM causes an intermittent hang, at > > least on some AMD CPUs. > > > > With qemu-x86_64 kvm cannot be used since the move to long mode (64-bit) > > is done in a way that works on real hardware but not with QEMU. This > > means that performance is 4-5x slower than it could be, at least on my > > CPU. > > > > We can work around the first problem by using Bochs, which is anyway a > > better choice than VESA for QEMU. The second can be addressed by using > > the same descriptor across the jump to long mode. > > > > With an MTRR fix this allows booting into Ubuntu on qemu-x86_64 > > This seems needlessly not against mainline.
I just tried it and yes there is a very small delta. I can resend it rebased to -next if you like. I'd really like to get some OS-booting tests into CI. Regards, Simon
