Hi,
Many onboard scsi controllers are multi-channel and use channel "B" as
internal bus. Anything on the external channel ("A") is attached before
the internal devices.
This applies e.g. to Intel SR1300 Servers with AIC-7902 U320 chipset.
The "reverse_scan" option doesn't seem to effect the multi-channel
probe order.
In the Adaptec BIOS you can specify the boot channel. This channel
should be scanned first. This works fine with AIC-78xx controllers.
The aic79xx driver ignores this setting. Looking at the code, I found it
disabled.
/usr/src/kernel-source-2.6.8/drivers/scsi/aic7xxx/aic79xx_osm.c:
*snip*
int
ahd_softc_comp(struct ahd_softc *lahd, struct ahd_softc *rahd)
{
int value;
/*
* Under Linux, cards are ordered as follows:
* 1) PCI devices that are marked as the boot controller.
* 2) PCI devices with BIOS enabled sorted by
bus/slot/func.
* 3) All remaining PCI devices sorted by bus/slot/func.
*/
#if 0
value = (lahd->flags & AHD_BOOT_CHANNEL)
- (rahd->flags & AHD_BOOT_CHANNEL);
if (value != 0)
/* Controllers set for boot have a *higher* priority */
return (value);
#endif
*snip*
Affected aic79xx driver versions are at 1.3.11 up to the latest Adaptec
version 2.0.12.
Removing the "# if 0 ... endif" statements causes the boot channel
probed first.
Christian
--
---=================================================================---
Christian Schoeniger, SYSADMIN, FES GmbH - Fahrzeug-Entwicklung Sachsen
phone: +49 375 56 60 254 fax: +49 375 56 60 92254 http://www.fes-aes.de
---===> I haven't lost my mind; I know exactly where I left it. <===---
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