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Fix flash writing on stm32l0

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Fix "couldn't use loader, falling back to page memory writes" error on
stm32l0 which was caused by the use of cortex-m3 instructions in the
flash loader code. The loader is rewritten using cortex-m0 compatible
instructions

Signed-off-by: Armin van der Togt <armin@otheruse.nl>
Change-Id: If23027b8e09f74e45129e1f8452a04bb994c424e
Reviewed-on: http://openocd.zylin.com/4036
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
This commit is contained in:
Armin van der Togt
2017-03-02 17:31:14 +01:00
committed by Freddie Chopin
parent 2e0e6c5634
commit ca9dcc86d7
2 changed files with 18 additions and 30 deletions
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16
src/flash/nor/stm32lx.c
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@@ -450,19 +450,7 @@ static int stm32lx_write_half_pages(struct flash_bank *bank, const uint8_t *buff
/* see contib/loaders/flash/stm32lx.S for src */
static const uint8_t stm32lx_flash_write_code[] = {
/* write_word: */
0x00, 0x23, /* movs r3, #0 */
0x04, 0xe0, /* b test_done */
/* write_word: */
0x51, 0xf8, 0x04, 0xcb, /* ldr ip, [r1], #4 */
0x40, 0xf8, 0x04, 0xcb, /* str ip, [r0], #4 */
0x01, 0x33, /* adds r3, #1 */
/* test_done: */
0x93, 0x42, /* cmp r3, r2 */
0xf8, 0xd3, /* bcc write_word */
0x00, 0xbe, /* bkpt 0 */
0x92, 0x00, 0x8A, 0x18, 0x01, 0xE0, 0x08, 0xC9, 0x08, 0xC0, 0x91, 0x42, 0xFB, 0xD1, 0x00, 0xBE
};
/* Make sure we're performing a half-page aligned write. */
@@ -588,7 +576,7 @@ static int stm32lx_write_half_pages(struct flash_bank *bank, const uint8_t *buff
* is reduced by 50% using this slower method.
*/
LOG_WARNING("couldn't use loader, falling back to page memory writes");
LOG_WARNING("Couldn't use loader, falling back to page memory writes");
while (count > 0) {
uint32_t this_count;