[U-Boot] a few questions about saving bootcount in the environment

[Robert P. J. Day]

  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

-- 

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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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