imx-atf: allow setting the UART used during boot

A new `ATF_BOOT_UART_BASE` variable can be used in machine to set the
UART aimed for use during the boot, without the need of changing the
source code.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
(cherry picked from commit 453def7956c864818b6d6a1a44b2b267df3a44fc)

1 files changed, 9 insertions, 0 deletions

diff --git a/conf/machine/include/imx-base.inc b/conf/machine/include/imx-base.inc
index 297637af7..2962c9e97 100644
--- a/conf/machine/include/imx-base.inc
+++ b/conf/machine/include/imx-base.inc
@@ -113,6 +113,15 @@ UBOOT_PROVIDES_BOOT_CONTAINER:imx-boot-container = "1"
 # Default TF-A provider to NXP downstream fork
 IMX_DEFAULT_ATF_PROVIDER ??= "imx-atf"
 
+# Allow setting the UART used during the boot by ATF.
+
+# FIXME: We should return INVALID here but currently only i.MX8M has support to override the UART
+# base address in source code.
+SOC_ATF_BOOT_UART_BASE                    = ""
+
+SOC_ATF_BOOT_UART_BASE:mx8m-generic-bsp   = "0x30890000"
+ATF_BOOT_UART_BASE                       ?= "${SOC_ATF_BOOT_UART_BASE}"
+
 PREFERRED_PROVIDER_virtual/xserver      = "xserver-xorg"
 XSERVER_DRIVER                          = "xf86-video-fbdev"
 XSERVER_DRIVER:vf-generic-bsp           = "xf86-video-modesetting"