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| author | Fabio Estevam <fabio.estevam@freescale.com> | 2013-02-07 06:45:23 +0000 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2013-02-12 13:54:34 +0100 |
| commit | 76c91e668a54a45fa06086d4044fcae0b6ce225a (patch) | |
| tree | d67aadea25803bfb73fad2aded5ad09e30302715 /Makefile | |
| parent | 7c92c540754a0c3756d467a9b0695f2a40d1fe86 (diff) | |
| download | talos-obmc-uboot-76c91e668a54a45fa06086d4044fcae0b6ce225a.tar.gz talos-obmc-uboot-76c91e668a54a45fa06086d4044fcae0b6ce225a.zip | |
mx6: Disable Power Down Bit of watchdog
On a mx6qsabresd revision C board with rev1.2 mx6q, the system gets resetted
and it is not able to reach the Linux prompt.
Comparing the watchdog behaviour on a revB versus revC board:
- On a mx6qsabresd revB:
U-Boot > reset
resetting ...
U-Boot 2013.01-10524-g432a3aa-dirty (Feb 07 2013 - 13:34:46)
CPU: Freescale i.MX6Q rev1.1 at 792 MHz
Reset cause: WDOG
...
- On a mx6qsabresd revC:
U-Boot > reset
resetting ...
U-Boot 2013.01-10524-g432a3aa-dirty (Feb 07 2013 - 13:34:46)
CPU: Freescale i.MX6Q rev1.1 at 792 MHz
Reset cause: POR
So due to revC POR/watchdog circuitry whenever a watchdog occurs, it causes a POR.
Clearing the PDE - Power Down Enable bit of WMCR registers fixes the problem and
is also safe for all mx6 boards.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions
