linux-kernel - Re: [Linux-fbdev-devel] [PATCH 1/2] fb: add support for foreign endianness

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <47BA162C.5000807@anagramm.de>
Date:	Tue, 19 Feb 2008 00:35:08 +0100
From:	Clemens Koller <clemens.koller@...gramm.de>
To:	linux-fbdev-devel@...ts.sourceforge.net
CC:	Krzysztof Helt <krzysztof.h1@...zta.fm>, adaplas@...il.com,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	avorontsov@...mvista.com
Subject: Re: [Linux-fbdev-devel] [PATCH 1/2] fb: add support for foreign	endianness

Valdis.Kletnieks@...edu schrieb:
> On Mon, 18 Feb 2008 08:18:47 +0100, Krzysztof Helt said:
>> I know two fb drivers which use endianess information (pm2fb and s3c2410fb).
>> Both resolve endianess at driver level. Actually, both handle it by setting special
>> bits so the graphics chip itself reorder bytes to transform foreign endianess. 
>> I understand that this patch is for chips which cannot reorder bytes by themselves.
> 
> Does anybody know of such a chip that's actually available in the wild?  Or are
> we writing drivers for speculative possible chips?
> 

I had troubles with the Silicon Motion SM501/SM502 endianess on PowerPC PCI vs. LocalBus.
The chip also has a register to swap endianess, but that seems to only affect some
LocalBus modes.
The current fb and X drivers are working, but when it comes to font
aliasing and hw-acceleration, the problems start to rise again...

Regards,

Clemens
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/