[U-Boot] [PATCH 2/2] arm: mxs: Add serial console support into SPL

[Marek Vasut]

Add support for serial console into the i.MX23/i.MX28 SPL. A full,
uncrippled serial console support comes very helpful when debugging
various spectacular hardware bringup issues early in the process.
Because we do not use SPL framework, but have our own minimalistic
SPL, which is compatible with the i.MX23/i.MX28 BootROM, we do not
use preloader_console_init(), but instead use a similar function to
start the console. Nonetheless, to avoid blowing up the size of the
SPL binary, this support is enabled only if CONFIG_SPL_SERIAL_SUPPORT
is defined, which is disabled by default.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Stefano Babic <sbabic at denx.de>
---
 arch/arm/cpu/arm926ejs/mxs/spl_boot.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
index 87b63c1..58ff8db 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
@@ -18,7 +18,8 @@
 #include "mxs_init.h"
 
 DECLARE_GLOBAL_DATA_PTR;
-gd_t gdata __section(".data");
+static gd_t gdata __section(".data");
+static bd_t bdata __section(".data");
 
 /*
  * This delay function is intended to be used only in early stage of boot, where
@@ -106,6 +107,16 @@ static uint8_t mxs_get_bootmode_index(void)
 	return i;
 }
 
+static void mxs_spl_console_init(void)
+{
+#ifdef CONFIG_SPL_SERIAL_SUPPORT
+	gd->bd = &bdata;
+	gd->baudrate = CONFIG_BAUDRATE;
+	serial_init();
+	gd->have_console = 1;
+#endif
+}
+
 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
 			 const iomux_cfg_t *iomux_setup,
 			 const unsigned int iomux_size)
@@ -116,6 +127,9 @@ void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
 	gd = &gdata;
 
 	mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
+
+	mxs_spl_console_init();
+
 	mxs_power_init();
 
 	mxs_mem_init();
-- 
1.8.5.2