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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: hirsute
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https://bugs.launchpad.net/bugs/1926801
Title:
BCM2835 SPI chipselect limit - kernel/driver panic
Status in linux package in Ubuntu:
Incomplete
Bug description:
Bug fix was just committed by Phil Elwell <[email protected]>, and
appears as response driver error reported for Raspberry Pi OS. I have
the same problem with driver in Ubuntu 21.04. My apology for not
knowing how driver fixes are coordinated across Pi OS and Ubuntu, so I
am providing the information here in hopes a fix will be made
available in Ubuntu 21.04. Please let me know if driver fix will be
available for 21.04.
As background, my previous comment on github in discussion of problem with
Mr. Elwell was:
A limit of 24 chipselects would work for me. -- This would likely solve
problem seeing a kernel panic (bad kernel memory reference) in
5.11.0-1007-raspi after configuring 6 chipselects for for BCM2835 SPI via
dtoverlay. Kernel panic is on shutdown/reboot, however, memory corruption for
more than 4 chipselects likely has other runtime consequences.
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Details on new driver commit for drivers/spi/spi-bcm2835.c from Mr. Elwell on
4-30-2021:
https://github.com/raspberrypi/linux/commit/05f8d5826e28e9d82485c03b65c18d5013ba13bd
spi: bcm2835: Increase the CS limit to 24
Increase the maximum number of CS lines to 24, and ensure this limit is
not exceeded.
See: #4281 -- https://github.com/raspberrypi/linux/pull/4281
Suggested-by: Joe Burmeister <[email protected]>
Signed-off-by: Phil Elwell <[email protected]>
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