On 10/11/2018 05:27 PM, Bin Meng wrote: > Hi Heinrich, > > On Thu, Oct 11, 2018 at 11:15 PM Heinrich Schuchardt <xypron.g...@gmx.de> > wrote: >> >> On 10/11/2018 03:53 AM, Bin Meng wrote: >>> Currently only 32-bit U-Boot for QEMU x86 is documented. Mention >>> the 64-bit support. >>> >>> Signed-off-by: Bin Meng <bmeng...@gmail.com> >>> --- >>> >>> doc/README.x86 | 8 ++++++-- >>> 1 file changed, 6 insertions(+), 2 deletions(-) >>> >>> diff --git a/doc/README.x86 b/doc/README.x86 >>> index 8cc4672..ab48466 100644 >>> --- a/doc/README.x86 >>> +++ b/doc/README.x86 >>> @@ -32,7 +32,7 @@ are supported: >>> - Link (Chromebook Pixel) >>> - Minnowboard MAX >>> - Samus (Chromebook Pixel 2015) >>> - - QEMU x86 >>> + - QEMU x86 (32-bit & 64-bit) >>> >>> As for loading an OS, U-Boot supports directly booting a 32-bit or 64-bit >>> Linux kernel as part of a FIT image. It also supports a compressed zImage. >>> @@ -376,7 +376,9 @@ QEMU x86 target instructions for bare mode: >>> >>> To build u-boot.rom for QEMU x86 targets, just simply run >>> >>> -$ make qemu-x86_defconfig >>> +$ make qemu-x86_defconfig (for 32-bit) >>> +or >>> +$ make qemu-x86_64_defconfig (for 64-bit) >>> $ make all >> >> If your patch series creates a U-Boot usable with QEMU depends on the >> chosen CPU: >> >> This one seems to work: >> qemu-system-x86_64 -bios u-boot.rom -nographic -cpu core2duo >> >> This one fails (as expected): >> qemu-system-x86_64 -bios u-boot.rom --nographic -cpu pentium > > Pentium does not support 64-bit, so it is expected. In my testing I > always omit the '-cpu' so this is not a problem. But I can document > this. > >> >> I could not get the emulation running without -nographic. Do you know why? >> > > This is due to currently the VGA support is missing in the 64-bit U-Boot. > >> The documentation above is insufficient. Please, provide a minimum QEMU >> command line which includes a CPU specification. >> >> I would prefer if you could specify two lines per bitness - one with kvm >> and one without, e.g. > > I doubt -enable-kvm works with U-Boot.
Why? It is just an instruction how QEMU should emulate the CPU. KVM does not require anything on the target software side. I have had no problem with KVM on the i386 target. Regards Heinrich > >> >> qemu-system-x86_64 -bios u-boot.rom -nographic -enable-kvm -cpu host >> qemu-system-x86_64 -bios u-boot.rom -nographic -cpu core2duo >> >> qemu-system-i386 -bios u-boot.rom -nographic -enable-kvm -cpu host >> qemu-system-i386 -bios u-boot.rom -nographic -cpu core2duo >> > > Will add more info in v2. > > Regards, > Bin > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
