flash/nor: Add erased_value to drivers and pass it to targets

struct flash_driver has a default_padded_value field that is similar,
but it can be changed by the user for the specific purpose of padding.

Add a new erased_value field and initialize it for all targets,
particularly stm32lx, xmc4xxx and virtual.

Use this value in core.c:default_flash_mem_blank_check(), the slow path.

Extend the target API to pass erased_value down to target code.
Adding an argument ensures that we catch all callers.

This allows us to merge xmc4xxx.c:xmc4xxx_blank_check_memory() into
armv7m:armv7m_blank_check_memory().

It further allows us to use default_flash_blank_check() in place of
xmc4xxx.c:xmc4xxx_flash_blank_check(), adding a potential slow path
fallback, as well as stm32lx:stm32lx_erase_check(), adding the potential
armv7m fast path with fallback to default_flash_mem_blank_check().

Fix a mips32 code comment while at it (zeroed -> erased).

The armv4_5 and mips32 target implementations will now error out if an
erase value other than 0xff is used, causing default_flash_blank_check()
to fall back to the default_flank_mem_blank_check() slow path.

Change-Id: I39323fbbc4b71c256cd567e439896d0245d4745f
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/3497
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/flash/nor/virtual.c b/src/flash/nor/virtual.c
index 3cb793e3..06981f4f 100644
--- a/src/flash/nor/virtual.c
+++ b/src/flash/nor/virtual.c
@@ -44,6 +44,7 @@ static void virtual_update_bank_info(struct flash_bank *bank)
 	bank->size = master_bank->size;
 	bank->chip_width = master_bank->chip_width;
 	bank->bus_width = master_bank->bus_width;
+	bank->erased_value = master_bank->erased_value;
 	bank->default_padded_value = master_bank->default_padded_value;
 	bank->num_sectors = master_bank->num_sectors;
 	bank->sectors = master_bank->sectors;