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)

2 files changed, 17 insertions, 1 deletions

diff --git a/conf/machine/include/imx-base.inc b/conf/machine/include/imx-base.inc
index 297637af..2962c9e9 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                       ?= "${SOC_ATF_BOOT_UART_BASE}"
+
 PREFERRED_PROVIDER_virtual/xserver      = "xserver-xorg"
 XSERVER_DRIVER                          = "xf86-video-fbdev"
 XSERVER_DRIVER:vf-generic-bsp           = "xf86-video-modesetting"
diff --git a/recipes-bsp/imx-atf/imx-atf_2.6.bb b/recipes-bsp/imx-atf/imx-atf_2.6.bb
index 95258247..194ef935 100644
--- a/recipes-bsp/imx-atf/imx-atf_2.6.bb
+++ b/recipes-bsp/imx-atf/imx-atf_2.6.bb
@@ -18,7 +18,11 @@ S = "${WORKDIR}/git"
 
 inherit deploy
 
-ATF_PLATFORM ??= "INVALID"
+ATF_PLATFORM          ??= "INVALID"
+
+# FIXME: We should return INVALID here but currently only i.MX8M has support to override the UART
+# base address in source code.
+ATF_BOOT_UART_BASE     ?= ""
 
 EXTRA_OEMAKE += " \
     CROSS_COMPILE="${TARGET_PREFIX}" \
@@ -48,6 +52,9 @@ EXTRA_OEMAKE += 'LD="${@remove_options_tail(d.getVar('LD'))}"'
 
 EXTRA_OEMAKE += 'CC="${@remove_options_tail(d.getVar('CC'))}"'
 
+# Set the UART to use during the boot.
+EXTRA_OEMAKE += 'IMX_BOOT_UART_BASE=${ATF_BOOT_UART_BASE}'
+
 do_configure[noexec] = "1"
 
 do_compile() {