Messages in this thread | | | Date | Sat, 13 Jul 2013 07:53:37 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH v2 1/3] x86, boot: add mmio serial during compressed boot |
| |
On 07/12/2013 11:47 PM, Yinghai Lu wrote: > > for 32 bit, that is ok. > for 64 bit via 32bit bootloader, arch/x86/boot/compressed/head_64.S > will set page table for first 4G still ok. > for 64 bit via 64bit loader, like kexec via bzImage64, First Kernel/Kexec only > set ident mapping for usable range, so mmio just under 64 is not mapped. > > Looks like we need to update boot.txt to add requirement for 64bit bootloader > that 0-4G need to be all ident mapping? >
I think that is an unrealistic requirement, especially if this is the sole user.
-hpa
| |