XO 1.75 hangs on countdown

[James Cameron]

A hang at the number "10" means that Open Firmware did not continue
past the point of setting up the page (section) table and turning on
the MMU and caches.

http://tracker.coreboot.org/trac/openfirmware/browser/cpu/arm/olpc/resetvec.fth#L144
is where the "10" is shown.  The "11" is just beyond, a few lines
down.

My guesses are:

- faulty memory,

- faulty processor,

- fault in wiring between processor and memory,

- incorrect firmware version for the memory, (some memory required a
  specific version),

- corrupt SPI FLASH.

Have you any further history on this laptop?

-- 
James Cameron
http://quozl.linux.org.au/