Previous code compiled with gcc-4.2.2 makes a call to __aeabi_uidiv to divide by 20. As a side effect it was not inline any more, and so sdram_cfg used the stack as well, but this is early code that has no stack yet. The patch explicitly removes the division, so no stack is used.
The calculation of the counter calls a division by 20
Signed-off-by: Alessandro Rubini rubini@gnudd.com --- board/edb93xx/early_udelay.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/board/edb93xx/early_udelay.h b/board/edb93xx/early_udelay.h index 3b26b3f..185283d 100644 --- a/board/edb93xx/early_udelay.h +++ b/board/edb93xx/early_udelay.h @@ -26,7 +26,7 @@ static inline void early_udelay(uint32_t usecs) { /* loop takes 4 cycles at 5.0ns (fastest case, running at 200MHz) */ - register uint32_t loops = (usecs * 1000) / 20; + register uint32_t loops = usecs * (1000 / 20);
__asm__ volatile ("1:\n" "subs %0, %1, #1\n"