[PATCH] board: rockchip: unblock CAN bus in spl_board_init on Jaguar

[Quentin Schulz]

Hi Jakob,

On 6/17/25 10:42 AM, Jakob Unterwurzacher wrote:
> GPIO0_B7 is routed to TXI of the on-board CAN transceiver. The
> line has a pull-down per SoC default.
> 
> This means the CAN transceiver transmits a dominant zero
> and blocks the CAN bus until Linux boots and reconfigures the pin.
> 
> Let's switch to pull-up as soon as we can (i.e. in SPL).
> This cuts down the "bus is blocked" time from 10 seconds to < 1 second.
> 
> Of course, to this needs CONFIG_SPL_BOARD_INIT, so enable it

-this

(No need to send a v2 just for that)

> the Jaguar defconfig.
> 
> Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher at cherry.de>

Reviewed-by: Quentin Schulz <quentin.schulz at cherry.de>

If we ever have an open DRAM init in U-Boot, we should move this to TPL 
so it's as early as possible in the boot process.

Thanks!
Quentin