From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon, 21 May 2007 22:50:43 +0200
To: 9fans@cse.psu.edu
Message-ID: <20070521205043.GA14281@mercurius.galaxy>
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From: frank@inua.be (Frank Lenaerts)
Subject: [9fans] sd53c8xx: bios scntl3(00) stest2(00)
Topicbox-Message-UUID: 6e295cfe-ead2-11e9-9d60-3106f5b1d025

Hi,

I want to learn Plan 9, so I downloaded the latest[*] version of the
live CD. 

I want to use the following PC hardware for this: 

- mainboard, CPU, memory: MSI K7T Turbo 2 (VIA VT82C686, KT133) with
  an AMD Duron 850 and 768 MB RAM
- storage: Tekram DC-390U2W SCSI controller (LSI Logic / Symbios Logic
  53c895 (rev 01)) with 2 x 36GB disks
- ethernet controllers: 2 x VT6102

When I boot Plan 9 from the CD, the system seems to hang:

--- begin ---
Plan 9
E820: 00000000 0009fc00 memory
E820: 0009fc00 000a0000 memory
E820: 000f0000 00100000 reserved
E820: 00100000 2fff0000 memory
E820: 2fff0000 2fff3000 acpi nvs
E820: 2fff3000 30000000 acpi reclaim
E820: ffff0000 10000000 reserved
126 holes free
00017000 0009f000 557056
00264000 10000000 265928704
266485760 bytes free
cpu0: 850MHz AuthenticAMD AMD-Athlon (cpuid: ...)
ELCR: 1E20
pcirouting: BIOS workaround: PCI.0.7.2 at pin 4 link 5 irq 11 -> 5
pcirouting: BIOS workaround: PCI.0.7.5 at pin 3 link 3 irq 10 -> 11
sd53c8xx: SYM53C895 rev. 0x01 intr=11 command=0007
768M memory: 256M kernel data, 511M user, 1136M swap
root is from (...)[local!#S/sdD0/data]:
sd53c8xx: bios scntl3(00) stest2(00)
---  end  ---

After this line, the system seems to hang i.e. it doesn't continue.

When I choose to install Plan 9 from the CD, the output is similar:

--- begin ---
...
768M memory: ...
kfs...version...time...

init: starting /bin/rc
sd53c8xx: bios scntl3(00) stest2(00)
---  end  ---

Before I get the menu to choose either 1 (install from CD) or 2 (boot
the CD), I also noticed the following line:

--- begin ---
sd53c8xx: bios scntl3(9f) stest2(00)
---  end  ---

It takes several seconds before this line "returns" and the menu is
presented.

I searched the web to see if this is a known issue, but didn't get any
usefull result. [The SYM53C895 seems to be supported well, but I'm not
sure if this is also valid for "rev. 0x01". In addition to that, I
also wonder if there might be a problem with irq sharing. According to
the ESCD data (from the BIOS), the SCSI controller and the "Multimedia
Device" (Bus 0, Dev 7, Func 5) share irq 11 (and the pcirouting (2nd
line) seems to be ok). Note that all PCI slots share irq's with one or
another slot/device.]

Can somebody explain me or point me to a document explaining me how to
debug or work around this issue? Can I somehow boot with more debug
information? If so, how can I do this?


[*] Mon May 21 04:50:24 EDT 2007 md5 e189331bf8f56370881f49efb85d9423
    sha1 68dce6328cffdd623f2b4fc47b3822a6fbc4302e plan9.iso.bz2


Kind regards,

-- 
Frank Lenaerts ---------------------------------------- frank@inua.be