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From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 3/4] ARM: nxp-imx8mm-evk: always set up UART
Date: Fri, 24 Jul 2020 13:12:32 +0200	[thread overview]
Message-ID: <20200724111233.23725-3-l.stach@pengutronix.de> (raw)
In-Reply-To: <20200724111233.23725-1-l.stach@pengutronix.de>

When the TF-A is configured to have some output on the UART it does not
set up the UART on its own, but just expects a pre-existing configuration.
If Barebox did not set up the UART in the !DEBUG_LL case, TF-A will just
hang without any user accessible debug output, which is a very non-obvious
failure, so better be safe and always set up the UART in case TF-A wants
to use it.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 arch/arm/boards/nxp-imx8mm-evk/lowlevel.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
index cd1f7d168bc6..082aefb8c1c5 100644
--- a/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
+++ b/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
@@ -32,9 +32,12 @@ static void setup_uart(void)
 
 	imx8mm_setup_pad(IMX8MM_PAD_UART2_TXD_UART2_TX | UART_PAD_CTRL);
 
-	imx8m_uart_setup_ll();
+	imx8mq_uart_setup((void *)MX8M_UART2_BASE_ADDR);
 
-	putc_ll('>');
+	if (IS_ENABLED(CONFIG_DEBUG_LL)) {
+		imx8m_uart_setup_ll();
+		putc_ll('>');
+	}
 }
 
 static void pmic_reg_write(void *i2c, int reg, uint8_t val)
@@ -157,8 +160,7 @@ static void start_atf(void)
  */
 static __noreturn noinline void nxp_imx8mm_evk_start(void)
 {
-	if (IS_ENABLED(CONFIG_DEBUG_LL))
-		setup_uart();
+	setup_uart();
 
 	start_atf();
 
-- 
2.20.1


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  parent reply	other threads:[~2020-07-24 11:12 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24 11:12 [PATCH 1/4] ARM: imx8mm: select FIRMWARE_IMX_LPDDR4_PMU_TRAIN from IMX8MM_EVK Lucas Stach
2020-07-24 11:12 ` [PATCH 2/4] ARM: imx8m: make debug UART selection available on i.MX8MM Lucas Stach
2020-08-03 19:36   ` Sascha Hauer
2020-07-24 11:12 ` Lucas Stach [this message]
2020-07-24 11:12 ` [PATCH 4/4] nvmem: ocotp: add support for i.MX8MM Lucas Stach

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