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-rw-r--r--m29f400bt.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/m29f400bt.c b/m29f400bt.c
index 86f9f96..809f33c 100644
--- a/m29f400bt.c
+++ b/m29f400bt.c
@@ -27,6 +27,69 @@
#include "m29f400bt.h"
#include "debug.h"
+void toggle_ready_m29f400bt(volatile uint8_t *dst)
+{
+ unsigned int i = 0;
+ uint8_t tmp1, tmp2;
+
+ tmp1 = *dst & 0x40;
+
+ while (i++ < 0xFFFFFF) {
+ tmp2 = *dst & 0x40;
+ if (tmp1 == tmp2) {
+ break;
+ }
+ tmp1 = tmp2;
+ }
+}
+
+void data_polling_m29f400bt(volatile uint8_t *dst, uint8_t data)
+{
+ unsigned int i = 0;
+ uint8_t tmp;
+
+ data &= 0x80;
+
+ while (i++ < 0xFFFFFF) {
+ tmp = *dst & 0x80;
+ if (tmp == data) {
+ break;
+ }
+ }
+}
+
+void protect_m29f400bt(volatile uint8_t *bios)
+{
+ *(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
+ *(volatile uint8_t *)(bios + 0x555) = 0x55;
+ *(volatile uint8_t *)(bios + 0xAAA) = 0xA0;
+
+ usleep(200);
+}
+
+void write_page_m29f400bt(volatile uint8_t *bios, uint8_t *src,
+ volatile uint8_t *dst, int page_size)
+{
+ int i;
+
+ for (i = 0; i < page_size; i++) {
+ *(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
+ *(volatile uint8_t *)(bios + 0x555) = 0x55;
+ *(volatile uint8_t *)(bios + 0xAAA) = 0xA0;
+
+ /* transfer data from source to destination */
+ *dst = *src;
+ //*(volatile char *) (bios) = 0xF0;
+ //usleep(5);
+ toggle_ready_m29f400bt(dst);
+ printf
+ ("Value in the flash at address %p = %#x, want %#x\n",
+ (uint8_t *) (dst - bios), *dst, *src);
+ dst++;
+ src++;
+ }
+}
+
int probe_m29f400bt(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
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