From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 4/4] ARM: nxp-imx8mq-evk: fix bootflow comment
Date: Thu, 19 Dec 2019 16:19:29 +0100 [thread overview]
Message-ID: <20191219151929.19521-4-l.stach@pengutronix.de> (raw)
In-Reply-To: <20191219151929.19521-1-l.stach@pengutronix.de>
The comment above nxp_imx8mq_evk_start is no longer accurate, as there
is no trampoline in DRAM anymore. Change the comment to reflect the current
boot flow.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
arch/arm/boards/nxp-imx8mq-evk/lowlevel.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c
index 213ab7068271..eb96c0805169 100644
--- a/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c
+++ b/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c
@@ -48,14 +48,13 @@ static void setup_uart(void)
* summary:
*
* 1. MaskROM uploads PBL into OCRAM and that's where this function is
- * executed for the first time
+ * executed for the first time. At entry the exception level is EL3.
*
- * 2. DDR is initialized and the TF-A trampoline is installed in the
- * DRAM.
+ * 2. DDR is initialized and the PBL is copied from OCRAM to the TF-A return
+ * address in DRAM.
*
- * 3. TF-A is executed and exits into the trampoline in RAM, which enters the
- * PBL for the second time. DRAM setup done is indicated by a one in register
- * x0 by the trampoline
+ * 3. TF-A is executed and exits into the PBL code in DRAM. TF-A has taken us
+ * from EL3 to EL2.
*
* 4. The piggydata is loaded from the SD card and copied to the expected
* location in the DRAM.
--
2.20.1
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next prev parent reply other threads:[~2019-12-19 15:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-19 15:19 [PATCH 1/4] ARM: nxp-imx8mq-evk: switch to SPDX license header Lucas Stach
2019-12-19 15:19 ` [PATCH 2/4] ARM: nxp-imx8mq-evk: switch the PBL memcpy parameters to common variables Lucas Stach
2019-12-19 15:19 ` [PATCH 3/4] ARM: nxp-imx8mq-evk: clean up nxp_imx8mq_evk_start Lucas Stach
2019-12-19 15:19 ` Lucas Stach [this message]
2019-12-20 15:15 ` [PATCH 1/4] ARM: nxp-imx8mq-evk: switch to SPDX license header Sascha Hauer
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