Re: compatability with older versions of UEFI

[Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>]

On Wed, 24 Jun, at 07:14:43PM, Luck, Tony wrote:
> > Another option would be to have 2 structs, the first one
> > "struct cper_sec_mem_err" holds the structure as defined by UEFI
> > 2.1, the 2nd one "struct cper_sec_mem_err_24_ext" holds the 4
> > elements added in UEFI 2.3.1.
> 
> Reading some more of the UEFI 2.5 spec ... I see we are in for a world of pain
> here.
> 
> 2.5 adds some small tweaks to the memory structure (adding a couple of extra
> bits to the "row" entry that can be grabbed from the formerly reserved byte
> at offset 73).  But then there is a whole new GUID for a "Memory Error Section 2"
> which has doubled the width of the device, row, column, rank, and bit_pos fields
> together with adding two new fields for chip_id and status.  This will be painful
> because we hardwired the old sizes into extlog_mem_event in <ras/ras_event.h>

Can't you just create a new memory event type? Granted, you'll need
changes to the ras daemon, but since there's a new GUID involved I think
that's forgivable.

-- 
Matt Fleming, Intel Open Source Technology Center