diff options
Diffstat (limited to 'cpu/mpc8xx')
| -rw-r--r-- | cpu/mpc8xx/cpu.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/cpu/mpc8xx/cpu.c b/cpu/mpc8xx/cpu.c index 5f92a37..4a32986 100644 --- a/cpu/mpc8xx/cpu.c +++ b/cpu/mpc8xx/cpu.c @@ -463,6 +463,8 @@ void upmconfig (uint upm, uint * table, uint size) /* ------------------------------------------------------------------------- */ +#ifndef CONFIG_LWMON + int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { ulong msr, addr; @@ -497,6 +499,32 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) return 1; } +#else /* CONFIG_LWMON */ + +/* + * On the LWMON board, the MCLR reset input of the PIC's on the board + * uses a 47K/1n RC combination which has a 47us time constant. The + * low signal on the HRESET pin of the CPU is only 512 clocks = 8 us + * and thus too short to reset the external hardware. So we use the + * watchdog to reset the board. + */ +int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + /* prevent triggering the watchdog */ + disable_interrupts (); + + /* make sure the watchdog is running */ + reset_8xx_watchdog ((immap_t *) CFG_IMMR); + + /* wait for watchdog reset */ + while (1) {}; + + /* NOTREACHED */ + return 1; +} + +#endif /* CONFIG_LWMON */ + /* ------------------------------------------------------------------------- */ /* @@ -558,6 +586,9 @@ void watchdog_reset (void) if (re_enable) enable_interrupts (); } +#endif /* CONFIG_WATCHDOG */ + +#if defined(CONFIG_WATCHDOG) || defined(CONFIG_LWMON) void reset_8xx_watchdog (volatile immap_t * immr) { |