The original implementation of delay function of ARM s3c44b0 doesnt' cooperate with U-Boot kernel well, which will cause fake-time-out. What is important is to keep timestamp in unit of millisecond.
diff -purN old/cpu/s3c44b0/interrupts.c new/cpu/s3c44b0/interrupts.c --- old/cpu/s3c44b0/interrupts.c 2005-12-17 00:39:27.000000000 +0800 +++ new/cpu/s3c44b0/interrupts.c 2008-11-13 20:36:46.000000000 +0800 @@ -147,7 +147,7 @@ static ulong lastdec; int interrupt_init (void) { TCFG0 = 0x000000E9; - TCFG1 = 0x00000004; + TCFG1 = 0x00000040; TCON = 0x00000900; TCNTB1 = TIMER_LOAD_VAL; TCMPB1 = 0; @@ -185,7 +185,7 @@ void udelay (unsigned long usec)
tmo = usec / 1000; tmo *= CFG_HZ; - tmo /= 8; + tmo /= 1000;
tmo += get_timer (0);
@@ -213,7 +213,7 @@ ulong get_timer_masked (void) } lastdec = now;
- return timestamp; + return (timestamp >> 3); }
void udelay_masked (unsigned long usec) @@ -225,10 +225,9 @@ void udelay_masked (unsigned long usec) if (usec >= 1000) { tmo = usec / 1000; tmo *= CFG_HZ; - tmo /= 8; + tmo /= 1000; } else { - tmo = usec * CFG_HZ; - tmo /= (1000*8); + tmo = 1; }
endtime = get_timer(0) + tmo;