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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 02/10] ARM: stm32mp157c-dk2: add optional DEBUG_LL print to entry point
Date: Tue, 12 Nov 2019 10:19:48 +0100	[thread overview]
Message-ID: <20191112091956.26628-2-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20191112091956.26628-1-a.fatoum@pengutronix.de>

The TF-A sets up pin muxing and clocking for the UART4 which is the UART
suggested by ST for use as debug console.

Eventually, we might want to do this ourselves to be sure, but for now
lets just stick in a putc_ll('>'), so user selecting DEBUG_LL can see
that barebox started.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 arch/arm/boards/stm32mp157c-dk2/lowlevel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
index 566ace79c956..2106eaadc93a 100644
--- a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
+++ b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
@@ -7,12 +7,21 @@
 
 extern char __dtb_z_stm32mp157c_dk2_start[];
 
+static void setup_uart(void)
+{
+	/* first stage has set up the UART, so nothing to do here */
+	putc_ll('>');
+}
+
 ENTRY_FUNCTION(start_stm32mp157c_dk2, r0, r1, r2)
 {
 	void *fdt;
 
 	arm_cpu_lowlevel_init();
 
+	if (IS_ENABLED(CONFIG_DEBUG_LL))
+		setup_uart();
+
 	fdt = __dtb_z_stm32mp157c_dk2_start + get_runtime_offset();
 
 	barebox_arm_entry(STM32_DDR_BASE, SZ_512M, fdt);
-- 
2.24.0.rc1


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  reply	other threads:[~2019-11-12  9:20 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-12  9:19 [PATCH 01/10] ARM: dts: stm32mp: move alias to SoC device tree Ahmad Fatoum
2019-11-12  9:19 ` Ahmad Fatoum [this message]
2019-11-12  9:19 ` [PATCH 03/10] mfd: stpmic1: use register define from header Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 04/10] watchdog: stm32_iwdg: return -ENOSYS on attempt to disable Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 05/10] i2c: stm32: use device_reset_us helper instead of open-coding Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 06/10] Documentation: boards: stm32mp: document boot error LED Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 07/10] ARM: stm32mp: add helper for querying ram size Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 08/10] ARM: stm32mp: add basic DDR controller driver Ahmad Fatoum
2019-11-13  9:28   ` [PATCH] fixup! " Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 09/10] ARM: stm32mp: add stm32mp_cpu_lowlevel_init with stack set up Ahmad Fatoum
2019-11-12  9:19 ` [PATCH 10/10] ARM: stm32mp: dk2: don't hard-code memory size Ahmad Fatoum
2019-11-13  9:29   ` [PATCH] fixup! " Ahmad Fatoum
2019-11-13 14:25 ` [PATCH 01/10] ARM: dts: stm32mp: move alias to SoC device tree Sascha Hauer

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