Update to Linux 4.14 with CBMEM console support

[paulmenzel]

Since Linux 4.12, selecting GOOGLE_MEMCONSOLE_COREBOOT exports the CBMEM console under /sys/firmware/log, cf. commit d384d6f4 (firmware: google memconsole: Add coreboot support).

To not rely on cbmem, it’d be a good idea to update to Linux 4.14, as that is the latest LTS series.

[osresearch]

I've built a branch with 4.14.56 support: https://github.com/osresearch/heads/tree/linux-4.14-update

However with BOARD=qemu-coreboot and the current coreboot-4.7 there is no log to be found in /sys/firmware/log. I've confirmed that cbmem --console shows output, so the console is being logged.

[paulmenzel]

On 07/18/18 12:21, Trammell Hudson wrote: I've built a branch with 4.14.56 support: https://github.com/osresearch/heads/tree/linux-4.14-update However with `BOARD=qemu-coreboot` and the current coreboot-4.7 there is no log to be found in `/sys/firmware/log`.

Did you load the module with `sudo modprobe memconsole_coreboot`?

[osresearch]

It should be built in, not as a module: https://github.com/osresearch/heads/blob/linux-4.14-update/config/linux-qemu.config#L2166

[paulmenzel]

On 07/18/18 12:38, Trammell Hudson wrote: It should be built in, not as a module: https://github.com/osresearch/heads/blob/linux-4.14-update/config/linux-qemu.config#L2166

Understood. Just to be sure, does `cbmem -c` show the messages?

[osresearch]

Yes, cbmem --console has the output. I increased the log level to be sure that there would be something on the console: a75d8a0

[osresearch]

4.14 is now in master