X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=sidebyside;f=lib_ppc%2Fcache.c;h=338b08bd77005f0b477ad594ce1c37d588943bf2;hb=f3f91f886bc8927fd692ac411b7423a87ffec532;hp=1292b71e6ef206321b0ecb36d7c3fc5d2a408548;hpb=be4880ebe4355e8782be4af4b337a1b98dffcbe3;p=oweals%2Fu-boot.git

diff --git a/lib_ppc/cache.c b/lib_ppc/cache.c
index 1292b71e6e..338b08bd77 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();
 	}