On Mon, 09 Feb 2015 23:19:11 +0100 Carl-Daniel Hailfinger <[email protected]> wrote:
> On 08.02.2015 22:16, Stefan Tauner wrote: > > On Sun, 08 Feb 2015 17:55:10 +0100 > > Carl-Daniel Hailfinger <[email protected]> wrote: > > > >> On 07.02.2015 19:49, Stefan Tauner wrote: > >>> Was implemented by SPARC newbies, does (cross-)compile but is not > >>> run-tested. > >>> > >>> Signed-off-by: Stefan Tauner <[email protected]> > >> Thanks! > >> > >> Quoting wikipedia: > >>> The endianness of the 32-bit SPARC V8 architecture is purely > >>> big-endian. The 64-bit SPARC V9 architecture uses big-endian > >>> instructions, but can access data in either big-endian or > >>> little-endian byte order, chosen either at the application instruction > >>> (load/store) level or at the memory page level (via an MMU setting). > >>> The latter is often used for accessing data from inherently > >>> little-endian devices, such as those on PCI buses. > >> If that is true, we are totally screwed. How can we even begin to > >> influence the instructions emitted by the compiler? And if the compiler > >> emits bigendian instructions by default, can that be overridden via MMU > >> setting? If yes, does Linux use the endianness manipulation via MMU for > >> PCI devices, in which case we'd have to treat the architecture as > >> littleendian from a flashrom POV? > >> > >> This is a nightmare. > >> > > Only if you make it one. :) > > Maybe this allows you to sleep better: > > https://gcc.gnu.org/ml/gcc-patches/2011-10/msg02240.html > > Excellent, this means GCC won't try to screw us. > > > > I am not sure if that "MMU settings" in wikipedia is referring to the > > address space identifiers (ASIs), but it definitely screams [citation > > needed]. > > In general the whole thing looks like a rather exotic if not esoteric > > feature added to make porting Windows easier... in any case I am very > > confident that it will not be encountered on real machines/OSes. > > Yay! > > > > So... the only question is if you agree and we commit this before > > tagging 0.9.8-rc1 or not. I don't care too much about SPARC support, > > but I *do* care about getting the release out. Please respond in a > > timely manner. > > With all this info and your excellent explanations on IRC, I want to say > Thank You! > Acked-by: Carl-Daniel Hailfinger <[email protected]> Let's hope I am correct. :) Thanks, committed in r1882. -- Kind regards/Mit freundlichen Grüßen, Stefan Tauner _______________________________________________ flashrom mailing list [email protected] http://www.flashrom.org/mailman/listinfo/flashrom
