libflash/file: greatly increase perf of file_erase()
Do 4096 byte chunks not 8 byte chunks. A ffspart invocation constructing
a 64MB PNOR goes from a couple of seconds to ~0.1seconds with this
patch.
@@ -117,15 +117,17 @@ static int file_write(struct blocklevel_device *bl, uint64_t dst, const void *sr
*/
static int file_erase(struct blocklevel_device *bl, uint64_t dst, uint64_t len)
{
- unsigned long long int d = ULLONG_MAX;
+ char buf[4096];
int i = 0;
int rc;
+ memset(buf, ~0, sizeof(buf));
+
while (len - i > 0) {
- rc = file_write(bl, dst + i, &d, len - i > sizeof(d) ? sizeof(d) : len - i);
+ rc = file_write(bl, dst + i, buf, len - i > sizeof(buf) ? sizeof(buf) : len - i);
if (rc)
return rc;
- i += len - i > sizeof(d) ? sizeof(d) : len - i;
+ i += (len - i > sizeof(buf)) ? sizeof(buf) : len - i;
}
return 0;
