Code Review / openocd.git / commit
? search:
summary | shortlog | log | commit | commitdiff | review | tree
(parent: 0cedf10) | patch
flash/nor/at91samd: Use 32-bit register writes for ST-Link compat 34/7234/3
authorKeith Packard <keithp@keithp.com>
Wed, 28 Sep 2022 21:02:52 +0000 (14:02 -0700)
committerAntonio Borneo <borneo.antonio@gmail.com>
Sat, 8 Oct 2022 07:52:28 +0000 (07:52 +0000)
commitaf75d70dc5e6d83c57c6e8ee1a23ef9b472d2d52
treed3694c13fbc70c484e67dee0c975bbf36150489atree | snapshot
parent0cedf10f8fd618b78190ce32a40f26dec0fb8253commit | diff
flash/nor/at91samd: Use 32-bit register writes for ST-Link compat

ST-Link v2 dongles can be used with many cortex-m parts, but they have
one limitation -- they can only perform 8-bit and 32-bit writes to the
target. 16-bit writes are done using a pair of 8-bit writes. While not
usually an issue, in the case of the at91samd flash driver, the 16-bit
'command' register must have both halves written in the same
operation.

Fortunately, this register has two pad bytes above it in the address
space, making it safe to always access with 32-bit operations.

Change-Id: I44b0db9406982a8db5818c0533d3101618741db2
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7234
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
src/flash/nor/at91samd.c diff | blob | history
Open On-Chip Debugger

Linking to existing account procedure

If you already have an account and want to add another login method you MUST first sign in with your existing account and then change URL to read https://review.openocd.org/login/?link to get to this page again but this time it'll work for linking. Thank you.

SSH host keys fingerprints

1024 SHA256:YKx8b7u5ZWdcbp7/4AeXNaqElP49m6QrwfXaqQGJAOk gerrit-code-review@openocd.zylin.com (DSA)
384 SHA256:jHIbSQa4REvwCFG4cq5LBlBLxmxSqelQPem/EXIrxjk gerrit-code-review@openocd.org (ECDSA)
521 SHA256:UAOPYkU9Fjtcao0Ul/Rrlnj/OsQvt+pgdYSZ4jOYdgs gerrit-code-review@openocd.org (ECDSA)
256 SHA256:A13M5QlnozFOvTllybRZH6vm7iSt0XLxbA48yfc2yfY gerrit-code-review@openocd.org (ECDSA)
256 SHA256:spYMBqEYoAOtK7yZBrcwE8ZpYt6b68Cfh9yEVetvbXg gerrit-code-review@openocd.org (ED25519)
+--[ED25519 256]--+
|=..              |
|+o..   .         |
|*.o   . .        |
|+B . . .         |
|Bo. = o S        |
|Oo.+ + =         |
|oB=.* = . o      |
| =+=.+   + E     |
|. .=o   . o      |
+----[SHA256]-----+
2048 SHA256:0Onrb7/PHjpo6iVZ7xQX2riKN83FJ3KGU0TvI0TaFG4 gerrit-code-review@openocd.zylin.com (RSA)