On Mon, Feb 24, 2025 at 04:05:49PM -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 > > In v3 some e820 patches are included to make booting reliable and avoid > ACPI tables being dropped. Also, several MTTR problems are addressed, to > support memory sizes above 4GB reliably.
This is based on your tree I guess and not next, because you've not rebased at least the prerequisite test/py series and I didn't try farther than that with applying this. -- Tom
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