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From: | Paolo Bonzini |
Subject: | [Qemu-devel] Re: [PATCH] lsi53c895a: Add missing registers and workaround for OS/2 Warp SYM8XX.ADD driver |
Date: | Thu, 30 Sep 2010 10:07:43 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100907 Fedora/3.1.3-1.fc13 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.3 |
On 09/30/2010 07:07 AM, Nicholas A. Bellinger wrote:
case 0x06: /* SDID */ - if ((val& 0xf) != (s->ssid& 0xf)) - BADF("Destination ID does not match SSID\n"); + /* + * This workaround is required by the SYM8XX.ADD driver for OS/2 Warp. + */ + if ((val& 0xf) != (s->ssid& 0xf)) { + DPRINTF("Destination ID does not match SSID, val: %02x" + " s->ssid: %02x, fixing up val\n", val, s->ssid); + val = s->ssid; + } s->sdid = val& 0xf; break;
I don't think the write is bogus, as the manual says "Writing these bits set the SCSI ID of the intended initiator or target during SCSI reselection or selection phases, respectively".
The value is never used by the device model, only read/written according to SCRIPTS and register read/writes. How does the OS/2 driver use it? Have you tried, just removing the "if" without replacing it?
Paolo
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