Converting to DM SERIAL for Kirkwood boards

[Michael Walle]

>> On 12/9/22 04:55, Tony Dinh wrote:
>> > Hi Simon et al,
>> >
>> > (Resend to include u-boot mailing list)
>> >
>> > I'm in the process of converting Kirkwood boards to use DM SERIAL. I
>> > could not seem to get it to work, having tried adding
>> > CONFIG_DM_SERIAL, and also playing with various  related CONFIG
>> > options  (CONFIG_SPECIFY_CONSOLE_INDEX and CONFIG_CONS_INDEX ). From
>> > my reading various board configurations that were already converted to
>> > DM_SERIAL, I'm under the impression that just turning on
>> > CONFIG_DM_SERIAL would work without any other addition.
>> >
>> > The board I'm testing is Zyxel NSA310S Kirkwood 6702 (6192) SoC.
>> >
>> > diff --git a/configs/nsa310s_defconfig b/configs/nsa310s_defconfig
>> > index afa0cad041..e81d1495bd 100644
>> > --- a/configs/nsa310s_defconfig
>> > +++ b/configs/nsa310s_defconfig
>> > @@ -41,7 +41,6 @@ CONFIG_ENV_OVERWRITE=y
>> >   CONFIG_ENV_IS_IN_NAND=y
>> >   CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>> >   CONFIG_NET_RANDOM_ETHADDR=y
>> > -CONFIG_NETCONSOLE=y
>> >   CONFIG_SYS_FAULT_ECHO_LINK_DOWN=y
>> >   CONFIG_SATA_MV=y
>> >   CONFIG_SYS_SATA_MAX_DEVICE=1
>> > @@ -53,6 +52,7 @@ CONFIG_MTD_RAW_NAND=y
>> >   CONFIG_PHY_MARVELL=y
>> >   CONFIG_MVGBE=y
>> >   CONFIG_MII=y
>> > +CONFIG_DM_SERIAL=y
>> >   CONFIG_SYS_NS16550=y
>> >   CONFIG_USB=y
>> >   CONFIG_USB_EHCI_HCD=y
>> >
>> > I also added kirkwood-nsa310s-u-boot.dtsi to help in running kwboot.
>> >
>> > &uart0 {
>> > u-boot,dm-pre-reloc;
>> > };
>> >
>> > I've tried kwboot the new u-boot image, and also flashed this image to
>> > NAND, and in both cases, I got a silent serial console. It seems to
>> > hang up right off the bat. Hope you can help by giving me some
>> > pointers on how to debug this.
>>
>> Might be that the alias is missing and / or that the uart DT node is
>> not enabled. Please give this test-only patch a try:
>>
>> diff --git a/arch/arm/dts/kirkwood-nsa310s.dts
>> b/arch/arm/dts/kirkwood-nsa310s.dts
>> index 09ee76c2a2e0..ca7a49af9ba4 100644
>> --- a/arch/arm/dts/kirkwood-nsa310s.dts
>> +++ b/arch/arm/dts/kirkwood-nsa310s.dts
>> @@ -17,6 +17,10 @@
>>          model = "Zyxel NSA310S";
>>          compatible = "zyxel,nsa320s", "marvell,kirkwood-88f6702",
>> "marvell,kirkwood";
>>
>> +       aliases {
>> +               serial0 = &uart0;
>> +       };
>> +
>>          memory {
>>                  device_type = "memory";
>>                  reg = <0x00000000 0x10000000>;
>> @@ -317,3 +321,8 @@
>>   &pcie0 {
>>          status = "okay";
>>   };
>> +
>> +&uart0 {
>> +       status = "okay";
>> +       u-boot,dm-pre-reloc;
>> +};
>
> Thanks for the patch! but the behavior is still the same (silent
> serial console and hung the board).
> 
> Thanks,
> Tony

Maybe this will help:
https://lore.kernel.org/u-boot/20220817193809.1059688-20-michael@walle.cc/

The lsxl is also a kirkwood based board.

-michael