Add support for selecting the erased bit value with a flag
Most flash chips are erased to ones and programmed to zeros. However, some
other chips, such as the ENE KB9012 internal flash, work the opposite way.
Change-Id: Ia7b0de8568e31f9bf263ba0ad6b051e837477b6b
Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/23258
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/flash.h b/flash.h
index a71fec1..f2c6cbe 100644
--- a/flash.h
+++ b/flash.h
@@ -130,6 +130,13 @@
#define FEATURE_4BA_NATIVE (FEATURE_4BA_READ | FEATURE_4BA_FAST_READ | FEATURE_4BA_WRITE)
#define FEATURE_4BA (FEATURE_4BA_ENTER | FEATURE_4BA_EXT_ADDR | FEATURE_4BA_NATIVE)
#define FEATURE_4BA_WREN (FEATURE_4BA_ENTER_WREN | FEATURE_4BA_EXT_ADDR | FEATURE_4BA_NATIVE)
+/*
+ * Most flash chips are erased to ones and programmed to zeros. However, some
+ * other flash chips, such as the ENE KB9012 internal flash, work the opposite way.
+ */
+#define FEATURE_ERASED_ZERO (1 << 16)
+
+#define ERASED_VALUE(flash) (((flash)->chip->feature_bits & FEATURE_ERASED_ZERO) ? 0x00 : 0xff)
enum test_state {
OK = 0,
@@ -309,7 +316,7 @@
int read_flash_to_file(struct flashctx *flash, const char *filename);
char *extract_param(const char *const *haystack, const char *needle, const char *delim);
int verify_range(struct flashctx *flash, const uint8_t *cmpbuf, unsigned int start, unsigned int len);
-int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum write_granularity gran);
+int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum write_granularity gran, const uint8_t erased_value);
void print_version(void);
void print_buildinfo(void);
void print_banner(void);