a few quick questions about this feature before i move on to the
more widely-used stuff involving bootcount.
first, it seems that there's not a lot of saving bootcount in the
environment ... as i see it, there's the taurus board, and there's the
boards that include "siemens-am33x-common.h", of which i see six:
include/configs/rut.h:#include "siemens-am33x-common.h"
include/configs/draco.h:#include "siemens-am33x-common.h"
include/configs/etamin.h:#include "siemens-am33x-common.h"
include/configs/rastaban.h:#include "siemens-am33x-common.h"
include/configs/pxm2.h:#include "siemens-am33x-common.h"
include/configs/thuban.h:#include "siemens-am33x-common.h"
so this tells me that there's not a whole lot of that feature being
used, so i won't spend much time on it.
also, just to confirm, the "upgrade_available" variable is used
*exclusively* for the case of bootcount in the environment and nowhere
else, correct? so, again, if i'm not using the environment, i don't
care about it.
finally, i read this in the README:
CONFIG_BOOTCOUNT_ENV
If no softreset save registers are found on the hardware
"bootcount" is stored in the environment. To prevent a
saveenv on all reboots, the environment variable
"upgrade_available" is used. If "upgrade_available" is
0, "bootcount" is always 0, if "upgrade_available" is
1 "bootcount" is incremented in the environment.
So the Userspace Applikation must set the "upgrade_available"
and "bootcount" variable to 0, if a boot was successfully.
now, i can see where one wants to reset "bootcount" to zero once you
boot successfully, but why would you also set "upgrade_available" to
zero? don't you want to keep using that feature when you boot in the
future?
rday
--
========================================================================
Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
LinkedIn: http://ca.linkedin.com/in/rpjday
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