[PATCH 0/5] arm: mvebu: turris_omnia: Fix hangup in debug UART

[Stefan Roese]

On 06.05.22 11:05, Pali Rohár wrote:
> If proper U-Boot on Turris Omnia tries to print something on debug UART
> then CPU hangs. Reason is that debug UART in proper U-Boot for Turris
> Omnia has incorrect configuration of base register. Base register is
> different in SPL and also in different stages of proper U-Boot.
> 
> Fix all these issues. Introduce new arch_very_early_init() ARM function
> which will be called at very early stage prior initialization of debug
> UART. Move code which moves internal mvebu registers to this function.
> And split configuration of DEBUG_UART_BASE into SPL and proper U-Boot
> to allow setting different values which matches current HW status.
> 
> With all these changes, it is possible call "printf" function in
> Turris Omnia's board_early_init_f() function in both SPL and proper
> U-Boot.
> 
> Pali Rohár (5):
>    arm: Add new config option ARCH_VERY_EARLY_INIT
>    arm: mvebu: Move internal registers in arch_very_early_init() function
>    serial: Add new config option SPL_DEBUG_UART_BASE
>    serial: ns16550: Add support for SPL_DEBUG_UART_BASE
>    arm: mvebu: turris_omnia: Fix DEBUG_UART_BASE
> 
>   arch/arm/Kconfig               |  6 ++++++
>   arch/arm/lib/crt0.S            |  5 +++++
>   arch/arm/mach-mvebu/Kconfig    |  1 +
>   arch/arm/mach-mvebu/Makefile   |  1 +
>   arch/arm/mach-mvebu/cpu.c      | 31 -------------------------------
>   arch/arm/mach-mvebu/lowlevel.S | 27 +++++++++++++++++++++++++++
>   configs/turris_omnia_defconfig |  3 ++-
>   drivers/serial/Kconfig         |  7 +++++++
>   drivers/serial/ns16550.c       |  4 ++--
>   9 files changed, 51 insertions(+), 34 deletions(-)
>   create mode 100644 arch/arm/mach-mvebu/lowlevel.S
> 

Applied with the corresponding additional patches to
u-boot-marvell/master

Thanks,
Stefan