Date: Mon, 03 Mar 2014 09:56:25 -0800 From: Alfred Perlstein <bright@mu.org> To: freebsd-arch@freebsd.org Subject: Re: newcons fb driver Message-ID: <5314C249.9000808@mu.org> In-Reply-To: <CAJ-Vmokv0r-rTCg15iWKLDcDLR8Hoh0WVgf3CDLNxz%2BONZ5EnQ@mail.gmail.com> References: <20140302085511.6354f9ac@zhabar.gateway.2wire.net> <CAJ-Vmo=jCGUxXs_GBoCm581wTouozWE=AQ3x1wBKYM_J3_dGrg@mail.gmail.com> <42130.1393829535@critter.freebsd.dk> <CAJ-Vmokv0r-rTCg15iWKLDcDLR8Hoh0WVgf3CDLNxz%2BONZ5EnQ@mail.gmail.com>
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On 3/2/14, 10:58 PM, Adrian Chadd wrote: > 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? I seem to recall this being a technique used back in my 386/msdos days. :) -Alfred
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