at91samd: Bail early if trying to write to protected sector

Bail early if trying to write to protected sector also mark the sector
we are writing to as dirty.

Change-Id: I892f83461792e1cc2dcccade7aa65717831a6805
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-on: http://openocd.zylin.com/2025
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

diff --git a/src/flash/nor/at91samd.c b/src/flash/nor/at91samd.c
index acda3bb7fc2a3911a8d2dce86e941ff17fb2871c..c0be3f7d1cac21975abdb3eea9645eca28f56b29 100644 (file)
--- a/src/flash/nor/at91samd.c
+++ b/src/flash/nor/at91samd.c
@@ -375,6 +375,18 @@ static int samd_erase(struct flash_bank *bank, int first, int last)
        return ERROR_OK;
 }
 
+static struct flash_sector *samd_find_sector_by_address(struct flash_bank *bank, uint32_t address)
+{
+       struct samd_info *chip = (struct samd_info *)bank->driver_priv;
+
+       for (int i = 0; i < bank->num_sectors; i++) {
+               if (bank->sectors[i].offset <= address &&
+                   address < bank->sectors[i].offset + chip->sector_size)
+                       return &bank->sectors[i];
+       }
+       return NULL;
+}
+
 /* Write an entire row (four pages) from host buffer 'buf' to row-aligned
  * 'address' in the Flash. */
 static int samd_write_row(struct flash_bank *bank, uint32_t address,
@@ -383,6 +395,18 @@ static int samd_write_row(struct flash_bank *bank, uint32_t address,
        int res;
        struct samd_info *chip = (struct samd_info *)bank->driver_priv;
 
+       struct flash_sector *sector = samd_find_sector_by_address(bank, address);
+
+       if (!sector) {
+               LOG_ERROR("Can't find sector corresponding to address 0x%08" PRIx32, address);
+               return ERROR_FLASH_OPERATION_FAILED;
+       }
+
+       if (sector->is_protected) {
+               LOG_ERROR("Trying to write to a protected sector at 0x%08" PRIx32, address);
+               return ERROR_FLASH_OPERATION_FAILED;
+       }
+
        /* Erase the row that we'll be writing to */
        res = samd_erase_row(bank, address);
        if (res != ERROR_OK)
@@ -411,6 +435,8 @@ static int samd_write_row(struct flash_bank *bank, uint32_t address,
                buf += chip->page_size;
        }
 
+       sector->is_erased = 0;
+
        return res;
 }