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add cautionary note about flashing a running device

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Daniel Barlow 2023-03-26 10:21:36 +01:00
parent a172180be8
commit a5630c1f30
1 changed files with 8 additions and 2 deletions
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10
doc/user.rst
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@ -58,6 +58,12 @@ command. You need to locate the "firmware" partition, which you can do
with a combination of :command:`dmesg` output and the contents of with a combination of :command:`dmesg` output and the contents of
:file:`/proc/mtd` :file:`/proc/mtd`
**Don't do this on a device that's running on the same flash partition
as you're about to overwrite, otherwise you're likely to crash it. Use
kexecboot (see "Updates to running devices" below) first to reboot
into a RAM-based system.**
.. code-block:: console .. code-block:: console
<5>[ 0.469841] Creating 4 MTD partitions on "spi0.0": <5>[ 0.469841] Creating 4 MTD partitions on "spi0.0":
@ -87,7 +93,7 @@ and then connect to the device and run
.. code-block:: console .. code-block:: console
flashcp firmware.bin /dev/mtd3 flashcp -v firmware.bin /dev/mtd3
@ -108,7 +114,7 @@ Flashing from the boot monitor
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If you are prepared to open the device and have a TTL serial adaptor If you are prepared to open the device and have a TTL serial adaptor
or some kind to connect it to, you can probably flash it using U-Boot. of some kind to connect it to, you can probably flash it using U-Boot.
This is quite hardware-specific: please refer to the Developer Manual. This is quite hardware-specific: please refer to the Developer Manual.