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target/cortex_m: check core implementor field

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Presently, we only look at the Part Number field of the CPUID, and
completely ignore the Implmentor field, simply assuming it to be ARM.

Parts have since been found, with different implementors, that use
overlapping part numbers, causing detection to fail.

Expand the "part number" field to be a full implementor+part number,
excluding the revision/patch fields, to make checking more reliable.

Change-Id: Id81774f829104f57a0c105320d0d2e479fa01522
Signed-off-by: Karl Palsson <karlp@tweak.au>
Reviewed-on: https://review.openocd.org/c/openocd/+/7845
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Karl Palsson
2023-08-02 21:38:58 +00:00
committed by Antonio Borneo
parent a4b4750e38
commit 05ee889155
7 changed files with 52 additions and 38 deletions
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2
src/flash/nor/stm32h7x.c
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@@ -795,7 +795,7 @@ static int stm32x_probe(struct flash_bank *bank)
/* STM32H74x/H75x, the second core (Cortex-M4) cannot read the flash size */
retval = ERROR_FAIL;
if (device_id == DEVID_STM32H74_H75XX
&& cortex_m_get_partno_safe(target) == CORTEX_M4_PARTNO)
&& cortex_m_get_impl_part(target) == CORTEX_M4_PARTNO)
LOG_WARNING("%s cannot read the flash size register", target_name(target));
else
retval = target_read_u16(target, stm32x_info->part_info->fsize_addr, &flash_size_in_kb);