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-rw-r--r--82802ab.c34
1 files changed, 27 insertions, 7 deletions
diff --git a/82802ab.c b/82802ab.c
index 38a5ce2..a191093 100644
--- a/82802ab.c
+++ b/82802ab.c
@@ -27,6 +27,7 @@
*/
#include <stdio.h>
+#include <string.h>
#include <stdint.h>
#include "flash.h"
@@ -110,6 +111,7 @@ int erase_82802ab_block(struct flashchip *flash, int offset)
{
volatile uint8_t *bios = flash->virtual_memory + offset;
volatile uint8_t *wrprotect = flash->virtual_registers + offset + 2;
+ int j;
uint8_t status;
// clear status register
@@ -128,6 +130,12 @@ int erase_82802ab_block(struct flashchip *flash, int offset)
// now let's see what the register is
status = wait_82802ab(flash->virtual_memory);
//print_82802ab_status(status);
+ for (j = 0; j < flash->page_size; j++) {
+ if (*(bios + j) != 0xFF) {
+ printf("BLOCK ERASE failed at 0x%x\n", offset);
+ return -1;
+ }
+ }
printf("DONE BLOCK 0x%x\n", offset);
return 0;
@@ -167,17 +175,29 @@ int write_82802ab(struct flashchip *flash, uint8_t *buf)
int page_size = flash->page_size;
volatile uint8_t *bios = flash->virtual_memory;
- erase_82802ab(flash);
- if (*bios != 0xff) {
- printf("ERASE FAILED\n");
- return -1;
- }
- printf("Programming page: ");
+ printf("Programming page: \n");
for (i = 0; i < total_size / page_size; i++) {
+ printf
+ ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
printf("%04d at address: 0x%08x", i, i * page_size);
+
+ /* Auto Skip Blocks, which already contain the desired data
+ * Faster, because we only write, what has changed
+ * More secure, because blocks, which are excluded
+ * (with the exclude or layout feature)
+ * or not erased and rewritten; their data is retained also in
+ * sudden power off situations
+ */
+ if (!memcmp((void *)(buf + i * page_size),
+ (void *)(bios + i * page_size), page_size)) {
+ printf("SKIPPED\n");
+ continue;
+ }
+
+ /* erase block by block and write block by block; this is the most secure way */
+ erase_82802ab_block(flash, i * page_size);
write_page_82802ab(bios, buf + i * page_size,
bios + i * page_size, page_size);
- printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
}
printf("\n");
protect_jedec(bios);
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