Trying to make this general purpose user-land flash burner
Corresponding to coreboot v1 svn r489.
diff --git a/am29f040b.c b/am29f040b.c
new file mode 100644
index 0000000..121297f
--- /dev/null
+++ b/am29f040b.c
@@ -0,0 +1,120 @@
+/*
+ * am29f040.c: driver for programming AMD am29f040b models
+ *
+ *
+ * Copyright 2000 Silicon Integrated System Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * Reference:
+ * AMD Am29F040B data sheet
+ * $Id$
+ */
+
+#include "flash.h"
+#include "jedec.h"
+
+static __inline__ erase_sector_29f040b (char * bios, unsigned long address)
+{
+ *(bios + 0x555) = 0xAA;
+ *(bios + 0x2AA) = 0x55;
+ *(bios + 0x555) = 0x80;
+ *(bios + 0x555) = 0xAA;
+ *(bios + 0x2AA) = 0x55;
+ *(bios + address) = 0x30;
+
+ sleep(2);
+
+ /* wait for Toggle bit ready */
+ toggle_ready_jedec(bios + address);
+}
+
+static __inline__ write_sector_29f040b(char * bios, unsigned char * src,
+ unsigned char * dst, unsigned int page_size)
+{
+ int i;
+
+ for (i = 0; i < page_size; i++) {
+ printf("0x%08x", (unsigned long) dst - (unsigned long) bios);
+
+ *(bios + 0x555) = 0xAA;
+ *(bios + 0x2AA) = 0x55;
+ *(bios + 0x555) = 0xA0;
+ *dst++ = *src++;
+
+ /* wait for Toggle bit ready */
+ toggle_ready_jedec(bios);
+
+ printf("\b\b\b\b\b\b\b\b\b\b");
+ }
+}
+
+int probe_29f040b (struct flashchip * flash)
+{
+ char * bios = flash->virt_addr;
+ unsigned char id1, id2;
+
+ *(bios + 0x555) = 0xAA;
+ *(bios + 0x2AA) = 0x55;
+ *(bios + 0x555) = 0x90;
+
+ id1 = *(unsigned char *) bios;
+ id2 = *(unsigned char *) (bios + 0x01);
+
+ *bios = 0xF0;
+
+ usleep(10);
+
+ if (id1 == flash->manufacture_id && id2 == flash->model_id)
+ return 1;
+
+ return 0;
+}
+
+int erase_29f040b (struct flashchip * flash)
+{
+ char * bios = flash->virt_addr;
+
+ *(bios + 0x555) = 0xAA;
+ *(bios + 0x2AA) = 0x55;
+ *(bios + 0x555) = 0x80;
+ *(bios + 0x555) = 0xAA;
+ *(bios + 0x2AA) = 0x55;
+ *(bios + 0x555) = 0x10;
+
+ usleep(10);
+ toggle_ready_jedec(bios);
+}
+
+int write_29f040b (struct flashchip * flash, char * buf)
+{
+ int i;
+ int total_size = flash->total_size * 1024, page_size = flash->page_size;
+ char * bios = flash->virt_addr;
+
+ printf ("Programming Page: ");
+ for (i = 0; i < total_size/page_size; i++) {
+ /* erase the page before programming */
+ erase_sector_29f040b(bios, i * page_size);
+
+ /* write to the sector */
+ printf ("%04d at address: ", i);
+ write_sector_29f040b(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");
+ }
+ printf("\n");
+}