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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>
This commit is contained in:
John Schmoller 2010-09-29 14:05:44 -05:00 committed by Wolfgang Denk
parent 7a8ddeea5e
commit c62491d260
1 changed files with 15 additions and 1 deletions
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16
arch/powerpc/lib/board.c
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@ -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, "");
/*