From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <399E898A.1564594C@student.ethz.ch> Date: Sat, 19 Aug 2000 15:20:10 +0200 From: Michel Dänzer MIME-Version: 1.0 To: mlan@cpu.lu CC: dmj+@andrew.cmu.edu, linuxppc-dev@lists.linuxppc.org Subject: Re: Control fb problem on 8500 References: <200008190718.JAA00823@piglet.grunz.lu> Content-Type: text/plain; charset=iso-8859-1 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Michel Lanners wrote: > On 18 Aug, this message from Daniel Jacobowitz echoed through cyberspace: > >> In fact, before, the line length was exactly hpixels * bytes/pixel, > >> whereas now there's an additional 0x20 bytes in each line. I have not > >> been able to boot a 2.4.0 kernel with any fix applied, but you could try > >> and build a version without those 0x20 bytes added (they are found in a > >> few spots inside controlfb.c). > >> > >> As to why these 0x20 bytes were added, anybody know an explanation? And, > >> if they do serve a purpose (I suppose so ;-), it would be better to add > >> the exact number of bytes as a #define somewhere... > > > > *sigh* > > > > I have no idea where this came from, but 0x20 means it has something to > > do with cursor support, I'd bet. I seem to recall someone talking > > about that a few months ago... that is how hardware cursor is generally > > implemented, by a 32 pixel block at the end of the scanline. > > That's what I was thinking about. However, I'm not sure that XFree > supports a display with discontiguous lines in video memory. I think I > read that somewhere in some mailing list or X doc... Can any of the > XFree specialists confirm? It does support that, if not directly then certainly via shadowfb. Maybe the shadowfb RefreshArea function would have to be modified to take account of this. > My XFree 4.0 goes into an infinite loop eating CPU time when I boot a > 2.4.0 kernel. Works fine here. I don't use the RPM stuff, stock 4.0.1/DRI . The other Michel, who once thought he was the glint maintainer -- Earthling Michel Dänzer (MrCooper) \ CS student and free software enthusiast Debian GNU/Linux (powerpc,i386) user \ member of XFree86 and The DRI Project ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/