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lwmon5: enable hardware watchdog 

Some boards (e.g. lwmon5) may use rather small watchdog intervals, so
causing it to reboot the board if U-Boot does a long busy-wait with
udelay(). Thus, for these boards we have to restart WD more
frequently.

This patch splits the busy-wait udelay() into smaller, predefined,
intervals, so that the watchdog timer may be resetted with the
configurable (CONFIG_WD_PERIOD) interval.

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
This commit is contained in:
Yuri Tikhonov 2008-02-21 14:23:42 +01:00 committed by Wolfgang Denk
parent bc77881247
commit 2e721094a7
2 changed files with 11 additions and 4 deletions
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3
include/configs/lwmon5.h
View File

@ -366,12 +366,11 @@
#define CFG_PCI_SUBSYS_VENDORID 0x10e8 /* AMCC */
#define CFG_PCI_SUBSYS_ID 0xcafe /* Whatever */
#if 0
/*
* ToDo: Watchdog is not test fully, so exclude it for now
*/
#define CONFIG_HW_WATCHDOG 1 /* Use external HW-Watchdog */
#endif
#define CONFIG_WD_PERIOD 40000 /* in usec */
/*
* For booting Linux, the board info and command line data

12
lib_ppc/time.c
View File

@ -23,6 +23,9 @@
#include <common.h>
#ifndef CONFIG_WD_PERIOD
# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default*/
#endif
/* ------------------------------------------------------------------------- */
@ -53,9 +56,14 @@ unsigned long usec2ticks(unsigned long usec)
*/
void udelay(unsigned long usec)
{
ulong ticks = usec2ticks (usec);
ulong ticks, kv;
wait_ticks (ticks);
do {
kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
ticks = usec2ticks (kv);
wait_ticks (ticks);
usec -= kv;
} while(usec);
}
/* ------------------------------------------------------------------------- */