RE: [Xen-devel] OpenIPMI on dom0

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> So, the BMC I have is on port 0xca8 instead of the default 
> 0xca2.  There's code in 
> linux-2.6.12-xen0/drivers/char/ipmi/ipmi_si_intf.c that is 
> supposed to read the SMBIOS tables to find out from the type 
> 38 structure what the actual BMC address is.
> This code uses isa_memcpy_fromio() to read memory from 
> 0xf0000 to 0xfffff, and appears to read all 0's, even though 
> in user-space I can use mmap() on /dev/mem and find the 
> SMBIOS entry point in that address space.

I presume you're using xen-unstable?

The dom0 kernel should have the bottom 1MB of machine memory mapper at
PAGE_OFFSET (3GB) so isa_memcpy_fromio should work OK. Are you sure its
not trying to read from a tale above 1MB? In which case you'll need to
ioremap it.

> so something else appears to be wrong here too, other than 
> isa_memcpy_fromio()'s only reading 0's from reserved memory 
> blocks.  The code to initialize a BMC starts in the
> init_one_smi() function in 
> linux-2.6.12-xen0/drivers/char/ipmi/ipmi_si_intf.c .  
> I think this code tries to send and write bytes from IO ports 
> using inb() and outb() and don't know whether these are known 
> to work with Xen or not.

inb/outb should work just fine, providing they are not to ports which
Xen already owns e.g. COM1, RTC, PIC etc. Xen shouldn't be interfering
with the BMC.

Ian

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