[U-Boot-Users] [PATCH V2] cfi-flash: Add CFG_FLASH_AUTOPROTECT_LIST

[Matthias Fuchs <matthias.fuchs@esd-electronics.com>]

This patch adds a configurable flash auto protection list that can be used
to make U-Boot protect flash regions in flash_init().

The idea has been discussed on the u-boot mailing list starting
on Nov 18th, 2007.

Even this patch brings a new feature it is used as a bugfix for 4xx
platforms where flash_init() does not completely protect the
monitor's flash range in all situations.

U-Boot protects the flash range from CFG_MONITOR_BASE to
(CFG_MONITOR_BASE + monitor_flash_len  - 1) by default. This does not
include the reset vector at 0xfffffffc.

Example:
#define CFG_FLASH_AUTOPROTECT_LIST {{0xfff80000, 0x80000}}

This config option will auto protect the last 512k of flash that
contains the bootloader on board like APC405 and PMC405.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
---
 drivers/mtd/cfi_flash.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index e3cfb8a..fad9e8b 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -169,6 +169,17 @@ flash_info_t flash_info[CFG_MAX_FLASH_BANKS];		/* FLASH chips info */
 #define CFG_FLASH_CFI_WIDTH	FLASH_CFI_8BIT
 #endif
 
+struct apl_s {
+	ulong start;
+	ulong size;
+};
+
+#if !defined(CFG_FLASH_AUTOPROTECT_LIST)
+struct apl_s apl[] = {};
+#else
+struct apl_s apl[] = CFG_FLASH_AUTOPROTECT_LIST;
+#endif
+
 typedef unsigned long flash_sect_t;
 
 /* CFI standard query structure */
@@ -1966,6 +1977,16 @@ unsigned long flash_init (void)
 		       CFG_ENV_ADDR_REDUND + CFG_ENV_SIZE_REDUND - 1,
 		       flash_get_info(CFG_ENV_ADDR_REDUND));
 #endif
+
+	for (i = 0; i < ARRAY_SIZE(apl); i++) {
+		debug ("autoprotecting from %08x to %08x\n",
+		       apl[i].start, apl[i].start + apl[i].size - 1);
+		flash_protect (FLAG_PROTECT_SET,
+			       apl[i].start,
+			       apl[i].start + apl[i].size - 1,
+			       flash_get_info (apl[i].start));
+	}
+
 	return (size);
 }
 
-- 
1.5.3