From: "Armin F. Gnosa" <mipslist@gnosa.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: <linux-mips@oss.sgi.com>
Subject: Re: Problem with PMAD-AA / DECStation 5000/200
Date: Fri, 10 Aug 2001 15:32:13 +0200 [thread overview]
Message-ID: <002601c121a0$de4f2fa0$237900d9@shodan> (raw)
In-Reply-To: Pine.GSO.3.96.1010810110057.2724F-100000@delta.ds2.pg.gda.pl
> I'm not sure how exactly the ROMs are wired (they're usually 8-bit);
> hopefully in a "natural" way. You can read most of ROMs under Linux via
> mmap()ping /dev/mem -- parts of ROMs may not be directly available to the
> host CPU if they contain option's CPU firmware. The MB ROM is remapped
> (byte-merged) by the chipset so that it can be read in 32-bit quantities
> as parts of it get executed directly (the I/O ASIC permits switching the
> byte merging off). Option ROMs are not remapped as they always get copied
> to the system RAM before execution. Their organization can be read from
> their headers as specified by the TURBOchannel firmware specification.
That sounds like an interesting alternative to pulling the PROM out of
its socket. Then, a program running on a DECStation 5000/200 should be
reading from 0x1F81C0000..0x1F1FFFFF, right? One question about Byte
Merging: Does it mean that I don't have to read bytewise but instead
DWORD-wise?
Regards,
Armin
WARNING: multiple messages have this Message-ID (diff)
From: "Armin F. Gnosa" <mipslist@gnosa.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: linux-mips@oss.sgi.com
Subject: Re: Problem with PMAD-AA / DECStation 5000/200
Date: Fri, 10 Aug 2001 15:32:13 +0200 [thread overview]
Message-ID: <002601c121a0$de4f2fa0$237900d9@shodan> (raw)
Message-ID: <20010810133213.x_7__LFCZZlOfqhwbcKoMM8w8RJA1gZQiQc89WPvlfU@z> (raw)
In-Reply-To: Pine.GSO.3.96.1010810110057.2724F-100000@delta.ds2.pg.gda.pl
> I'm not sure how exactly the ROMs are wired (they're usually 8-bit);
> hopefully in a "natural" way. You can read most of ROMs under Linux via
> mmap()ping /dev/mem -- parts of ROMs may not be directly available to the
> host CPU if they contain option's CPU firmware. The MB ROM is remapped
> (byte-merged) by the chipset so that it can be read in 32-bit quantities
> as parts of it get executed directly (the I/O ASIC permits switching the
> byte merging off). Option ROMs are not remapped as they always get copied
> to the system RAM before execution. Their organization can be read from
> their headers as specified by the TURBOchannel firmware specification.
That sounds like an interesting alternative to pulling the PROM out of
its socket. Then, a program running on a DECStation 5000/200 should be
reading from 0x1F81C0000..0x1F1FFFFF, right? One question about Byte
Merging: Does it mean that I don't have to read bytewise but instead
DWORD-wise?
Regards,
Armin
next prev parent reply other threads:[~2001-08-10 13:32 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-09 15:35 Problem with PMAD-AA / DECStation 5000/200 Armin F. Gnosa
2001-08-09 15:35 ` Armin F. Gnosa
2001-08-09 15:51 ` Florian Lohoff
2001-08-09 16:20 ` Jan-Benedict Glaw
2001-08-09 16:22 ` Martin Schulze
2001-08-09 16:35 ` Jan-Benedict Glaw
2001-08-10 9:00 ` Maciej W. Rozycki
2001-08-10 9:10 ` Jan-Benedict Glaw
2001-08-10 9:11 ` Maciej W. Rozycki
2001-08-10 13:32 ` Armin F. Gnosa [this message]
2001-08-10 13:32 ` Armin F. Gnosa
2001-08-13 11:30 ` Maciej W. Rozycki
2001-08-10 0:29 ` Problems mounting RedHat 7.0 or 7.1 from oss.sgi site Wayne Gowcher
2001-08-10 4:55 ` H . J . Lu
2001-08-13 17:34 ` Benchmark performance Wayne Gowcher
2001-08-13 17:34 ` Wayne Gowcher
2001-08-14 7:51 ` Ralf Baechle
2001-08-14 15:29 ` Wayne Gowcher
2001-08-16 3:56 ` Atsushi Nemoto
2001-08-16 7:43 ` Carsten Langgaard
2001-08-16 9:11 ` Kevin D. Kissell
2001-08-16 9:11 ` Kevin D. Kissell
2001-08-16 11:06 ` Ralf Baechle
2001-08-16 11:15 ` Atsushi Nemoto
2001-08-16 9:18 ` Ralf Baechle
2001-08-16 11:07 ` Carsten Langgaard
2001-08-16 11:14 ` Ralf Baechle
2001-08-24 9:06 ` Atsushi Nemoto
2001-08-24 18:27 ` Ralf Baechle
2001-08-10 8:54 ` Problem with PMAD-AA / DECStation 5000/200 Armin F. Gnosa
2001-08-10 8:54 ` Armin F. Gnosa
2001-08-10 10:33 ` Florian Lohoff
2001-08-12 20:32 ` Ralf Baechle
2001-08-12 20:40 ` Armin F. Gnosa
2001-08-12 20:40 ` Armin F. Gnosa
2001-08-12 20:41 ` Jan-Benedict Glaw
2001-08-13 9:58 ` Ralf Baechle
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