Date: Fri, 22 Sep 95 22:40:52 +0400 From: vak@cronyx.ru To: bde@zeta.org.au, current@FreeBSD.org, josh@American.COM Subject: Re: more ATAPI CD issues Message-ID: <AAqCmOmWK0@crox.net.kiae.su> References: <199509221313.XAA07515@godzilla.zeta.org.au>
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> >This test could fail for single-drive configurations.
> >The driver does not set the drive unit number to 0 before testing
> >the cylinder register. If the BIOS leaves it set to 1, then the test
> >will fail...
>
> I tried toggling the drive select bit (in a debugger with interrupts
> off) on a single-drive IDE system and the test continued to work. The
> status register changed from 0x50 to 0x00 (0x00 for the nonexistent
> drive) and the cyl_lo register held values written to it. The altsts
> register did not change from 0xf0.
I tested it from the other end: my new CD-ROM drive (Wearnes 120A)
failed on the cyl_lo check. I added the unit 0 select before it:
outb(du->dk_port + wd_sdh, WDSD_IBM);
Now it works fine. (The patch is posted to freebsd-current)
Serge
---
Serge Vakulenko <vak@cronyx.msk.su>
Cronyx Ltd., Moscow Unix consulting and custom programming
phone: +7 (095) 939-23-23 FreeBSD support
fax: +7 (095) 939-03-00 Relcom network development
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