Re: [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default

Linus Walleij
2022-06-28T13:10:09Z

On Wed, Jun 22, 2022 at 9:40 PM Saravana Kannan <saravanak@google.com> wrote:

> Actually, why isn't earlyconsole being used? That doesn't get blocked
> on anything and the main point of that is to have console working from
> really early on.

For Arm (arch/arm) there is a special low-level debug option call low-level
debug, which you find in e.g:
arch/arm/Kconfig.debug
arch/arm/kernel/debug.S

This debug facility can print to the UART fifo before even MMU is up, pretty
much from the first instruction the kernel executes.

The versatility of LL-debug means that developers do not use earlyconsole
much on Arm.

I don't know about arm64 though.

Yours,
Linus Walleij