[U-Boot] [PATCH] common/memsize: panic if maxsize is not power of two

[Iru Cai]

The memory write and recover loop in get_ram_size() work correctly
only if maxsize is power of two, otherwise the function will return a
small size.

Signed-off-by: Iru Cai <mytbk920423 at gmail.com>
---
 common/memsize.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/memsize.c b/common/memsize.c
index 13b0047786..f627149a05 100644
--- a/common/memsize.c
+++ b/common/memsize.c
@@ -33,6 +33,10 @@ long get_ram_size(long *base, long maxsize)
 	long           size;
 	int            i = 0;
 
+	if ((maxsize & (maxsize - 1)) != 0) {
+		panic("maxsize must be power of 2!");
+	}
+
 	for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) {
 		addr = base + cnt;	/* pointer arith! */
 		sync();
-- 
2.23.0