In 5.2 kernel a new mechanism was introduced which embeds the kernel
headers in the kernel image and exposes them in procfs for simplified
use by userland tools.
It was introduced in
43d8ce9d65
and later modified a bit in
f7b101d330
The archive containing the header files had nondeterminism through the
header files metadata - specifically `mtime`, but I also decided to
normalize some other aspects just in case.
In our default setup we currently compile this as a module, so to expose
the headers to test the functionality `kheaders` needs to be loaded.
See https://lkml.org/lkml/2019/10/4/1036 and
https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git/commit/?h=fixes&id=2cc99c9cdc8fde5e92e34f9655829449cebd3e00
I commented out the documentation part of the patch to make it cleanly apply to
5.2 and 5.3, see remark in the patch itself.
Quoting from the splitString docstring:
NOTE: this function is not performant and should never be used.
This replaces trivial uses of splitString for splitting version
strings with the (potentially builtin) splitVersion.
Build was failing because we were depending on tagged versions of
the deblobbing scripts. The tags are not updated and thus newer
changes required won't be reflected unless the tag is re-created, which
might not be reliably the case.
So bumping revision and switching to use the branches to access the
deblob scripts.
For context, in our case the missing change is:
--- /nix/store/sfc0rrhj5l44zpqgpsymq5750k5wzg8p-tags-r16790/4.19-gnu/deblob-4.19 1970-01-01 01:00:01.000000000 +0100
+++ ../deblob-4.19 2019-09-14 14:53:44.637404289 +0200
@@ -1879,7 +1879,11 @@
announce BRCMFMAC - "Broadcom IEEE802.11n embedded FullMAC WLAN driver"
reject_firmware drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
-reject_firmware drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+if grep -q firmware_request_nowarn drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c; then
+ reject_firmware_nowarn drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+else
+ reject_firmware drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+fi
clean_blob drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c
clean_blob drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
