At present, DM_FLAG_PRE_RELOC is set only if !OF_CONTROL. It doesn't make sense for this para-virtualized driver.
With this patch applied, you will be able to see early boot messages:
U-Boot 2020.10-00001-ge442e71a6c52-dirty (Oct 15 2020 - 11:02:25 +0900) xenguest
Xen virtual CPU Model: XENVM-4.15 DRAM: 128 MiB PVBLOCK: (XEN) gnttab_mark_dirty not implemented yet pvblock: 0 In: hypervisor Out: hypervisor Err: hypervisor xenguest#
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- drivers/serial/serial_xen.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/drivers/serial/serial_xen.c b/drivers/serial/serial_xen.c index ba6504b94796..ed191829f059 100644 --- a/drivers/serial/serial_xen.c +++ b/drivers/serial/serial_xen.c @@ -175,8 +175,6 @@ U_BOOT_DRIVER(serial_xen) = { .priv_auto_alloc_size = sizeof(struct xen_uart_priv), .probe = xen_serial_probe, .ops = &xen_serial_ops, -#if !CONFIG_IS_ENABLED(OF_CONTROL) .flags = DM_FLAG_PRE_RELOC, -#endif };