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authorHans de Goede <hdegoede@redhat.com>2016-02-09 22:38:31 +0100
committerTom Rini <trini@konsulko.com>2016-02-10 08:34:42 -0500
commitcc8d698fabf072f49ef4dfb2cfdbe0f57d54af81 (patch)
tree48c1b36af1e2d5bb6ef788e25ad4a2e44ec2c80b /common/memsize.c
parentc82ce04a3f38bb91465da6b2fd9d8dcb0e81f94b (diff)
downloadu-boot-cc8d698fabf072f49ef4dfb2cfdbe0f57d54af81.tar.gz
Revert "common/memsize.c: Simplify RAM size detection"
This commit breaks bootup on sunxi boards, the get stuck when running the main u-boot binary at: CPU: Allwinner H3 (SUN8I) I2C: ready DRAM: This reverts commit 8e7cba048baae68ee0916a8f52b4304277328d5e. Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'common/memsize.c')
-rw-r--r--common/memsize.c47
1 files changed, 26 insertions, 21 deletions
diff --git a/common/memsize.c b/common/memsize.c
index 5c0d279625..0fb9ba57b6 100644
--- a/common/memsize.c
+++ b/common/memsize.c
@@ -33,28 +33,38 @@ long get_ram_size(long *base, long maxsize)
long size;
int i = 0;
- for (cnt = (maxsize / sizeof(long)) >> 1; cnt >= 0; cnt >>= 1) {
+ for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) {
addr = base + cnt; /* pointer arith! */
sync();
- save[i] = *addr;
+ save[i++] = *addr;
sync();
- if (cnt) {
- i++;
- *addr = ~cnt;
- } else {
- *addr = 0;
- }
+ *addr = ~cnt;
}
+ addr = base;
+ sync();
+ save[i] = *addr;
+ sync();
+ *addr = 0;
+
sync();
- cnt = 0;
- do {
+ if ((val = *addr) != 0) {
+ /* Restore the original data before leaving the function. */
+ sync();
+ *addr = save[i];
+ for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
+ addr = base + cnt;
+ sync();
+ *addr = save[--i];
+ }
+ return (0);
+ }
+
+ for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
addr = base + cnt; /* pointer arith! */
val = *addr;
- *addr = save[i--];
- sync();
- if (((cnt == 0) && (val != 0)) ||
- ((cnt != 0) && (val != ~cnt))) {
+ *addr = save[--i];
+ if (val != ~cnt) {
size = cnt * sizeof(long);
/*
* Restore the original data
@@ -64,16 +74,11 @@ long get_ram_size(long *base, long maxsize)
cnt < maxsize / sizeof(long);
cnt <<= 1) {
addr = base + cnt;
- *addr = save[i--];
+ *addr = save[--i];
}
return (size);
}
-
- if (cnt)
- cnt = cnt << 1;
- else
- cnt = 1;
- } while (cnt < maxsize / sizeof(long));
+ }
return (maxsize);
}