[Skiboot] external/gard: Alternate mtd or FDT entries?

[Patrick Williams]

I see the 'gard' tool by default will search the FDT entry
"/proc/device-tree/chosen/ibm,system-flash" for the location of the MTD
block device for writing.  I believe that will point us to the 'current'
side.

If we were booted from the golden side of PNOR, is there any way for us
to write / clear the non-golden side?  The '-f' option seems to be
exclusively for files and not MTD.
-- 
Patrick Williams
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