Error building PX30 Ringneck with WDT support

[Quentin Schulz]

Hi all,

I'm trying to add watchdog support to the PX30 Ringneck board but it 
fails to compile:

"""
diff --git a/configs/ringneck-px30_defconfig 
b/configs/ringneck-px30_defconfig
index b314636b4d9..3dab0dab5d4 100644
--- a/configs/ringneck-px30_defconfig
+++ b/configs/ringneck-px30_defconfig
@@ -122,6 +122,10 @@ CONFIG_USB_EHCI_HCD=y
  CONFIG_USB_EHCI_GENERIC=y
  CONFIG_USB_GADGET=y
  CONFIG_USB_GADGET_DWC2_OTG=y
+# CONFIG_WATCHDOG is not set
+# CONFIG_WATCHDOG_AUTOSTART is not set
+CONFIG_DESIGNWARE_WATCHDOG=y
+CONFIG_WDT=y
  CONFIG_SPL_TINY_MEMSET=y
  CONFIG_TPL_TINY_MEMSET=y
  CONFIG_LZO=y
"""

$ make CROSS_COMPILE="aarch64-linux-gnu-" ringneck-px30_defconfig
$ make CROSS_COMPILE="aarch64-linux-gnu-"
[...]
/usr/bin/aarch64-linux-gnu-ld.bfd: lib/time.o: in function `udelay':
/home/qschulz/work/upstream/u-boot/lib/time.c:199: undefined reference 
to `schedule'
/home/qschulz/work/upstream/u-boot/lib/time.c:199:(.text.udelay+0x1c): 
relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol 
`schedule'
make[1]: *** [scripts/Makefile.spl:527: tpl/u-boot-tpl] Error 1
make: *** [Makefile:2073: tpl/u-boot-tpl] Error 2

FWIW, I had this kept on a downstream U-Boot (v2022.10, on top of: 
https://git.theobroma-systems.com/ringneck-u-boot.git/log/?h=v2022.10-ringneck) 
and it both compiled and worked. I assume this may be related to the 
"new" cyclic support?

Looking for pointers as somehow I don't really understand the error. 
schedule() definition seems to be existing in headers included in 
lib/time.c so a bit clueless at the moment. Probably related to TPL also 
as it doesn't fail in neither proper nor SPL build stages it seems.

Cheers,
Quentin