If we call flush_cache(0xfffff000, 0x1000) it would never terminate the loop since end = 0xffffffff and we'd roll over our counter from 0xfffffe0 to 0 (assuming a 32-byte cache line)
Signed-off-by: Kumar Gala galak@kernel.crashing.org --- lib_ppc/cache.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/lib_ppc/cache.c b/lib_ppc/cache.c index 1292b71..338b08b 100644 --- a/lib_ppc/cache.c +++ b/lib_ppc/cache.c @@ -33,14 +33,16 @@ void flush_cache(ulong start_addr, ulong size) start = start_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1); end = start_addr + size - 1;
- for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) { + for (addr = start; (addr <= end) && (addr >= start); + addr += CONFIG_SYS_CACHELINE_SIZE) { asm volatile("dcbst 0,%0" : : "r" (addr) : "memory"); WATCHDOG_RESET(); } /* wait for all dcbst to complete on bus */ asm volatile("sync" : : : "memory");
- for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) { + for (addr = start; (addr <= end) && (addr >= start); + addr += CONFIG_SYS_CACHELINE_SIZE) { asm volatile("icbi 0,%0" : : "r" (addr) : "memory"); WATCHDOG_RESET(); }