This will now enable flash automagically for chipsets on which it knows how

Currently, only e7500 supported, but it is easy to add more.

Corresponding to coreboot v1 svn r744.

Makefile

@@ -4,7 +4,7 @@ OBJS += 82802ab.o
 CC = gcc -O2 -g
 
 all: ${OBJS}
-	${CC} -o flash_rom flash_rom.c ${OBJS}
+	${CC} -o flash_rom flash_rom.c ${OBJS} -lpci
 #	${CC} -o flash_on flash_on.c
 
 clean:

flash_rom.c

@@ -32,6 +32,7 @@
 #include <sys/io.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <pci/pci.h>
 
 #include "flash.h"
 #include "jedec.h"
@@ -68,7 +69,7 @@ struct flashchip flashchips[] = {
     {NULL,}
 };
 
-int enable_flash_sis630 (void)
+int enable_flash_sis630 (struct pci_dev *dev, char *name)
 {
     char b;
 
@@ -122,6 +123,29 @@ int enable_flash_sis630 (void)
     return 0;
 }
 
+int
+enable_flash_e7500(struct pci_dev *dev, char *name) {
+  /* register 4e.b gets or'ed with one */
+  unsigned char old, new;
+  int ok;
+  /* if it fails, it fails. There are so many variations of broken mobos
+   * that it is hard to argue that we should quit at this point. 
+   */
+  
+  old = pci_read_byte(dev, 0x4e);
+
+  new = old | 1;
+
+  ok = pci_write_byte(dev, 0x4e, new);
+
+  if (ok != new) {
+    printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 
+	   old, new, name);
+    return -1;
+  }
+  return 0;
+}
+
 struct flashchip * probe_flash(struct flashchip * flash)
 {
     int fd_mem;
@@ -220,6 +244,52 @@ myusec_delay(time)
 
 }
 
+typedef struct penable {
+  unsigned short vendor, device; 
+  char *name;
+  int (*doit)(struct pci_dev *dev, char *name);
+} FLASH_ENABLE;
+
+FLASH_ENABLE enables[] = {
+
+  {0x1, 0x1, "sis630 -- what's the ID?", enable_flash_sis630},
+  {0x8086, 0x2480, "E7500", enable_flash_e7500},
+};
+  
+int
+enable_flash_write() {
+  int i;
+  struct pci_access *pacc;
+  struct pci_dev *dev = 0;
+  unsigned int c;
+  FLASH_ENABLE *enable = 0;
+
+  pacc = pci_alloc();           /* Get the pci_access structure */
+  /* Set all options you want -- here we stick with the defaults */
+  pci_init(pacc);               /* Initialize the PCI library */
+  pci_scan_bus(pacc);           /* We want to get the list of devices */
+
+  /* now let's try to find the chipset we have ... */
+  for(i = 0; i < sizeof(enables)/sizeof(enables[0]) && (! dev); i++) {
+    struct pci_filter f;
+    struct pci_dev *z;
+    /* the first param is unused. */
+    pci_filter_init((struct pci_access *) 0, &f);
+    f.vendor = enables[i].vendor;
+    f.device = enables[i].device;
+    for(z=pacc->devices; z; z=z->next)
+      if (pci_filter_match(&f, z)) {
+	enable = &enables[i];
+	dev = z;
+      }
+  }
+
+  /* now do the deed. */
+  enable->doit(dev, enable->name);
+  return 0;
+}
+
+int
 main (int argc, char * argv[])
 {
     char * buf;
@@ -233,6 +303,11 @@ main (int argc, char * argv[])
 	printf(" is that flash info is dumped\n");
     }
 
+    /* try to enable it. Failure IS an option, since not all motherboards
+     * really need this to be done, etc., etc. It sucks.
+     */
+    (void) enable_flash_write();
+    
     if ((flash = probe_flash (flashchips)) == NULL) {
 	printf("EEPROM not found\n");
 	exit(1);
@@ -241,7 +316,7 @@ main (int argc, char * argv[])
     printf("Part is %s\n", flash->name);
     if (argc < 2){
 	printf("OK, only ENABLING flash write, but NOT FLASHING\n");
-        exit(0);
+	return 0;
     }
     size = flash->total_size * 1024;