On 10/13/2018 05:06 PM, 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> > > --- > Changes in this version: > - add more information about 64-bit support > > doc/README.x86 | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > diff --git a/doc/README.x86 b/doc/README.x86 > index 8cc4672..64da4ac 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 > > Note this default configuration will build a U-Boot for the QEMU x86 i440FX > @@ -479,6 +481,19 @@ Here the kernel (bzImage) is loaded to 01000000 and > initrd is to 04000000. Then, > > => zboot 01000000 - 04000000 1b1ab50 > > +To run 64-bit U-Boot, qemu-system-x86_64 should be used instead, e.g.: > +$ qemu-system-x86_64 -nographic -bios path/to/u-boot.rom > + > +Specific CPU can be specified via the '-cpu' parameter but please make
A specfic CPU ... > +sure the specified CPU supports 64-bit like '-cpu core2duo'. Conversely > +'-cpu pentium' won't work for obvious reasons that the processor only > +supports 32-bit. > + > +Note 64-bit support is very preliminary at this point. Lots of features > +are missing in the 64-bit world. One notable feature is VGA console ... is the VGA console ... > +support which is currently missing, so that you must specify '-nographic' > +to get 64-bit U-Boot up and running. > + > Updating U-Boot on Edison > ------------------------- > By default Intel Edison boards are shipped with preinstalled heavily > Reviewed-by: Heinrich Schuchardt <xypron.g...@gmx.de> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
