Hi Graham, On Thu, Feb 14, 2013 at 7:47 PM, Graeme Russ <graeme.r...@gmail.com> wrote: > Hi Simon, > > On Fri, Feb 15, 2013 at 2:35 PM, Simon Glass <s...@chromium.org> wrote: >> Hi Graeme, >> >> On Thu, Feb 14, 2013 at 2:36 PM, Graeme Russ <graeme.r...@gmail.com> wrote: >>> Hi Simon, >>> >>> On Fri, Feb 15, 2013 at 1:18 AM, Simon Glass <s...@chromium.org> wrote: >>>> This code is pretty old and we want to support only 32-bit systems now. >>>> Keep the real mode-to-protected code in case we want to boot an x86 from >>>> power-up, but invert the polarity of the option. >>>> >>>> Signed-off-by: Simon Glass <s...@chromium.org> > > [snip] > >>>> diff --git a/README b/README >>>> index 6106e0d..7b50720 100644 >>>> --- a/README >>>> +++ b/README >>>> @@ -3820,10 +3820,9 @@ Low Level (hardware related) configuration options: >>>> If defined, the x86 reset vector code is included. This is >>>> not >>>> needed when U-Boot is running from Coreboot. >>>> >>>> -- CONFIG_X86_NO_REAL_MODE >>>> - If defined, x86 real mode code is omitted. This assumes a >>>> - 32-bit environment where such code is not needed. You will >>>> - need to do this when U-Boot is running from Coreboot. >>>> +- CONFIG_X86_REAL_MODE >>>> + If defined, some 86 real mode code is included. This is not >>>> + needed when U-Boot is running from Coreboot. >>> >>> I think this config option can be punted completely. This define is >>> only used to pull in the real-mode trampoline code which switches from >>> protected-mode to real-mode before jumping into the Linux kernel's >>> real-mode stub. The code for the initial real-mode to protected-mode >>> switch will be pulled in by CONFIG_X86_RESET_VECTOR >> >> I suppose I am confused about what is needed here. I will drop the >> flag, and arch/x86/lib/realmode_switch.S. Is that right? > > Correct. All you need to keep is: > > arch/x86/cpu/resetvec.S > arch/x86/cpu/start16 > > And these are conditional on CONFIG_X86_RESET_VECTOR > > Looking at the most recent patch, I think you have it nailed now
OK, thanks for your help with it Regards, Simon > > Regards, > > Graeme _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
