Converting to DM SERIAL for Kirkwood boards

[Tony Dinh]

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.

Thanks,
Tony