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imx-atf: Disable Cortex-M7 debug console 

The Cortex-M7 uses the UART4 as debug console, and it is
shared with the Cortex-A53. This commit disables it for the
ConnectCore 8M Nano DVK board to avoid conflicts.

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
This commit is contained in:
Arturo Buzarra 2019-12-27 10:39:00 +01:00
parent 712fa3f96a
commit 41156ef05f
2 changed files with 34 additions and 0 deletions
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32
meta-digi-arm/recipes-bsp/imx-atf/imx-atf/0001-imx8mn-Disable-M7-debug-console.patch Normal file
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@ -0,0 +1,32 @@
From: Arturo Buzarra <arturo.buzarra@digi.com>
Date: Fri, 27 Dec 2019 09:42:48 +0100
Subject: [PATCH] imx8mn: Disable M7 debug console
The Cortex-M7 uses the UART4 as debug console, and it is
shared with the Cortex-A53.
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
---
plat/imx/imx8mn/imx8mn_bl31_setup.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/plat/imx/imx8mn/imx8mn_bl31_setup.c b/plat/imx/imx8mn/imx8mn_bl31_setup.c
index 57db28a..a36c2d5 100644
--- a/plat/imx/imx8mn/imx8mn_bl31_setup.c
+++ b/plat/imx/imx8mn/imx8mn_bl31_setup.c
@@ -242,11 +242,12 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
#endif
bl31_tzc380_setup();
/* Assign M7 to domain 1 */
mmio_write_32(IMX_RDC_BASE + 0x204, 0x1);
- mmio_write_32(IMX_RDC_BASE + 0x518, 0xfc);
+ /* Uncomment to use the M7 debug console (shared with A53 UART4) */
+ /*mmio_write_32(IMX_RDC_BASE + 0x518, 0xfc);*/
mmio_write_32(IMX_RDC_BASE + 0x5A4, 0xf3);
}
void bl31_plat_arch_setup(void)
{
--

2
meta-digi-arm/recipes-bsp/imx-atf/imx-atf_2.0.bb
View File

@ -15,6 +15,8 @@ SRCBRANCH = "imx_4.14.98_2.2.0"
SRC_URI = "${ATF_SRC};branch=${SRCBRANCH}"
SRCREV = "1355c5d12d75c9c7bdd08826796096bab519b3d5"
SRC_URI_append_ccimx8mn = " file://0001-imx8mn-Disable-M7-debug-console.patch"
S = "${WORKDIR}/git"
BOOT_TOOLS = "imx-boot-tools"