Date: Sun, 2 Mar 2014 22:58:19 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Justin Hibbits <jhibbits@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: newcons fb driver Message-ID: <CAJ-Vmokv0r-rTCg15iWKLDcDLR8Hoh0WVgf3CDLNxz%2BONZ5EnQ@mail.gmail.com> In-Reply-To: <42130.1393829535@critter.freebsd.dk> References: <20140302085511.6354f9ac@zhabar.gateway.2wire.net> <CAJ-Vmo=jCGUxXs_GBoCm581wTouozWE=AQ3x1wBKYM_J3_dGrg@mail.gmail.com> <42130.1393829535@critter.freebsd.dk>
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On 2 March 2014 22:52, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > In message <CAJ-Vmo=jCGUxXs_GBoCm581wTouozWE=AQ3x1wBKYM_J3_dGrg@mail.gmail.com> > , Adrian Chadd writes: > >>.. i'm pretty sure there was a reason for why it's done in byte sizes. >>Maybe speak to phk? > > Buggy video hardware, which does not do larger writes correctly, > the most recent one being an Intel Laptop, but I can't remember which. > > At the very least, byte writes needs to be a boot-time option. Is there a way to detect this? Ie, writing to video memory and then reading it back a byte at a time to see if the patterns match? -a
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