ppc: Don't initialize write protected NOR flashes

If a NOR flash is write protected it can not be initialized/detected so
add the ability for boards to skip NOR initialization on bootup.  A
board can skip NOR initialization by implementing the
board_flash_wp_on() function.

Signed-off-by: John Schmoller <jschmoller@xes-inc.com>
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
CC: sr@denx.de
Acked-by: Stefan Roese <sr@denx.de>

diff --git a/arch/powerpc/lib/board.c b/arch/powerpc/lib/board.c
index c0c7fd4f6ee0caf89ae2d859e606ce39edc7e35a..2e0749da0a545a3d15300903c9e5def269a8bdac 100644 (file)
--- a/arch/powerpc/lib/board.c
+++ b/arch/powerpc/lib/board.c
@@ -175,6 +175,16 @@ void __board_add_ram_info(int use_default)
 }
 void board_add_ram_info(int) __attribute__((weak, alias("__board_add_ram_info")));
 
+int __board_flash_wp_on(void)
+{
+       /*
+        * Most flashes can't be detected when write protection is enabled,
+        * so provide a way to let U-Boot gracefully ignore write protected
+        * devices.
+        */
+       return 0;
+}
+int board_flash_wp_on(void) __attribute__((weak, alias("__board_flash_wp_on")));
 
 static int init_func_ram (void)
 {
@@ -698,7 +708,11 @@ void board_init_r (gd_t *id, ulong dest_addr)
 #if !defined(CONFIG_SYS_NO_FLASH)
        puts ("FLASH: ");
 
-       if ((flash_size = flash_init ()) > 0) {
+       if (board_flash_wp_on()) {
+               printf("Uninitialized - Write Protect On\n");
+               /* Since WP is on, we can't find real size.  Set to 0 */
+               flash_size = 0;
+       } else if ((flash_size = flash_init ()) > 0) {
 # ifdef CONFIG_SYS_FLASH_CHECKSUM
                print_size (flash_size, "");
                /*