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On Sun, 19 Dec 1999, Stephen Hobbs wrote:

> Hi folks,
> 
> Given that there is a method for disabling podules at boot time (podule.x diable),
> is there a way to specify that a podule slot has a particular card in it?
At the moment no.
> For instance, I have a Cumana SCSI card with a PowerROM, which makes it useless for NetBSD.
> If I could override the auto-detect then I could use card...
> 
> Also, where ROMs are not SA compatible, I have had to remove the ROMs, but can still use
> the cards under RiscOS by softloading the modules. Fine until booting BSD, when the podule
> is once again invisible to the system...
> 
> I had a quick look in the bootloader code but found nothing, so I guess it's not available.
> Where abouts would something like that need to be added?
Ok the thing to do would be to pass specify something like say

podule?=xxxxyyyy

where ? is the podule number, xxxx is the the vendor ID and yyyy is the
product id.
The podulebus code would need to pass this option in the bootargs and
use it to override. A simple implementation could be done in podulebus.c
at the point at which the the disable is checked for. This would allow
cards with a powerrom to be overriden with the original vendor/product ID.
This mechanism could also be used for the podule disable in order to
simplify the number of options having to be parsed.
What is more work is using this mechanism to replace IDs lost due to the
ROM being removed for SA110 compatibility. It would work for some cards
and not others. Some drivers e.g. ether3 would work ok but some drivers
rely on some of the extra information in the podule header which would
need fallback defaults etc. e.g. interrupt mask and bits if the ROM
provides interrupts services.

You might like to try the attached patch to
arch/arm32/podulebus/podulebus.c that should do this override. I have not
tested it as I don't have an RPC to hand for a few weeks but it does
compile. If it works I'll commit it.

Cheers,
				Mark

PS. The ideal way of handling the powerroms would be if there was a method
of identifing the actual card without using the ID. e.g. other data in the
rom etc. but I have never been able to get any information from alsystems
on how this can be acheived and the person I spoke to was not sure if you
could.


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