On Mon, 6 Apr 2015, Robert Nelson wrote:
> On Mon, Apr 6, 2015 at 7:47 AM, Robert P. J. Day <[email protected]>
> wrote:
> >
> > more nitpicky pedantry ... i was under the impression that if
> > one wanted to identify the model of beaglebone, one could read the
> > EEPROM and, near the beginning, one would find the ID string of
> > "A335BONE" for the original BBW and "A335BNLT" for the newer BBB,
> > correct?
> >
> > so, first, that means that it would *not* be sufficient to simply
> > read "A335" to claim that the board was specifically a BBB, would it?
> >
> > and, second, i chanced across element 14's BBB SRM here:
> >
> > http://www.farnell.com/datasheets/1818802.pdf
> >
> > where in table 6 on p. 58, the EEPROM contents list (allegedly for the
> > *BBB*), the board name in ASCII of "A335BONE", which is for the BBW,
> > no? so that table seems incorrect.
> >
> > or am i just misunderstanding the EEPROM contents?
>
> Looks like a direct copy & paste from the BeagleBone White..
... which means that, for what it's worth, element 14's alleged BBB
SRM is wrong in at least the contents of that table -- a minor point,
perhaps, unless you're using that info to verify the precise board
model (BBB versus BBW) from the EEPROM.
BTW, robert, the only reason i noticed that was i was reading your
flasher script and in the function check_eeprom() was the check:
eeprom_header=$(hexdump -e '8/1 "%c"' ${eeprom} -s 5 -n 3)
if [ "x${eeprom_header}" = "x335" ] ; then
message="Valid BBB EEPROM header found" ; broadcast
and i vaguely remembered that the matching "335" would only verify a
beaglebone, not necessarily a BBB, even though the very next line
claims to have found a valid "BBB" EEPROM header (although,
admittedly, that flasher script would never be run on a BBW).
back to reading ...
rday
--
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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
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