diff mbox series

[v3,2/3] configs/stm32f746_disco_sd: new defconfig

Message ID 20240822183742.3550055-3-dario.binacchi@amarulasolutions.com
State New
Headers
Series tinyinit and stm32f746_disco_sd_defconfig |

Commit Message

Dario Binacchi Aug. 22, 2024, 6:37 p.m. UTC 
The commit adds support for STM32F746G-DISCO board. The discovery kit is
a complete demonstration and development platform for STMicroelectronics
Arm Cortex-M7-core-based STM32F746NG.

Board support package includes the following components:
- mainline Linux kernel 5.15.165
- mainline U-Boot 2024.07
- default packages from buildroot

Link: https://www.st.com/en/evaluation-tools/32f746gdiscovery.html
Co-Developed-by: Waldemar Brodkorb <wbx@openadk.org>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
---

Changes v2 -> v3:
 - Replace BR2_INIT_TINYINIT=y with BR2_INIT_NONE=y and
   BR2_PACKAGE_TINYINIT=y in stm32f746_disco_sd_defconfig.

Changes v1 -> v2:
 - Move Linux kernel from version 5.15.163 to 5.15.165.
 - Drop busybox-tiny.config and use package/busybox/busybox-minimal.config.
 - Remove the logo management.
 - Add the Tested-by tag.
 - Update the commit message

 DEVELOPERS                                    |  2 ++
 .../stm32f746-disco/extlinux.conf             |  4 +++
 .../stm32f746-disco/flash_sd.sh               | 22 +++++++++++++
 .../stm32f746-disco/genimage.cfg              | 27 ++++++++++++++++
 .../stm32f746-disco/linux.fragment            | 13 ++++++++
 .../patches/linux-headers/linux-headers.hash  |  1 +
 .../stm32f746-disco/patches/linux/linux.hash  |  2 ++
 .../stm32f746-disco/patches/uboot/uboot.hash  |  2 ++
 .../stm32f746-disco/post-build.sh             |  9 ++++++
 .../stm32f746-disco/readme.txt                | 31 ++++++++++++++++++
 configs/stm32f746_disco_sd_defconfig          | 32 +++++++++++++++++++
 11 files changed, 145 insertions(+)
 create mode 100644 board/stmicroelectronics/stm32f746-disco/extlinux.conf
 create mode 100755 board/stmicroelectronics/stm32f746-disco/flash_sd.sh
 create mode 100644 board/stmicroelectronics/stm32f746-disco/genimage.cfg
 create mode 100644 board/stmicroelectronics/stm32f746-disco/linux.fragment
 create mode 120000 board/stmicroelectronics/stm32f746-disco/patches/linux-headers/linux-headers.hash
 create mode 100644 board/stmicroelectronics/stm32f746-disco/patches/linux/linux.hash
 create mode 100644 board/stmicroelectronics/stm32f746-disco/patches/uboot/uboot.hash
 create mode 100755 board/stmicroelectronics/stm32f746-disco/post-build.sh
 create mode 100644 board/stmicroelectronics/stm32f746-disco/readme.txt
 create mode 100644 configs/stm32f746_disco_sd_defconfig

Comments

'Abel Vesa' via Amarula Linux Aug. 23, 2024, 4:20 p.m. UTC | #1 
Hello,

On Thu, 22 Aug 2024 20:37:41 +0200
Dario Binacchi <dario.binacchi@amarulasolutions.com> wrote:

> diff --git a/board/stmicroelectronics/stm32f746-disco/flash_sd.sh b/board/stmicroelectronics/stm32f746-disco/flash_sd.sh
> new file mode 100755
> index 000000000000..4fe85448f984
> --- /dev/null
> +++ b/board/stmicroelectronics/stm32f746-disco/flash_sd.sh
> @@ -0,0 +1,22 @@
> +#!/bin/bash
> +
> +if [ $# -eq 0 ]; then
> +    OUTPUT_DIR=output
> +else
> +    OUTPUT_DIR=$1
> +fi
> +
> +if ! test -d "${OUTPUT_DIR}" ; then
> +    echo "ERROR: no output directory specified."
> +    echo "Usage: $0 OUTPUT_DIR"
> +    exit 1
> +fi
> +
> +"${OUTPUT_DIR}"/host/bin/openocd -f board/stm32f746g-disco.cfg \
> +  -c "init" \
> +  -c "reset init" \
> +  -c "flash probe 0" \
> +  -c "flash info 0" \
> +  -c "flash write_image erase ${OUTPUT_DIR}/images/u-boot.bin 0x08000000" \
> +  -c "reset run" \
> +  -c "shutdown"

Could you keep the indentation consistent? Above you used 4 spaces, and
here only 2.

> diff --git a/board/stmicroelectronics/stm32f746-disco/genimage.cfg b/board/stmicroelectronics/stm32f746-disco/genimage.cfg
> new file mode 100644
> index 000000000000..6743d41972c0
> --- /dev/null
> +++ b/board/stmicroelectronics/stm32f746-disco/genimage.cfg
> @@ -0,0 +1,27 @@
> +image boot.vfat {
> +	vfat {
> +		files = {
> +			"zImage",
> +			"stm32f746-disco.dtb",
> +			"extlinux"
> +		}
> +	}
> +
> +	size = 16M
> +}
> +
> +image sdcard.img {
> +	hdimage {
> +	}
> +
> +	partition u-boot {

Why is this partition called u-boot? It doesn't contain anything u-boot
related.

> +		partition-type = 0xC
> +		image = "boot.vfat"

But why is a VFAT partition needed in fact? Why can't U-Boot simply get
the kernel+DTB from the ext4 rootfs partition?


> diff --git a/board/stmicroelectronics/stm32f746-disco/post-build.sh b/board/stmicroelectronics/stm32f746-disco/post-build.sh
> new file mode 100755
> index 000000000000..2894ad851c66
> --- /dev/null
> +++ b/board/stmicroelectronics/stm32f746-disco/post-build.sh
> @@ -0,0 +1,9 @@
> +#!/bin/sh
> +BOARD_DIR="$(dirname "$0")"
> +
> +install -m 0644 -D "${BOARD_DIR}"/extlinux.conf "${BINARIES_DIR}"/extlinux/extlinux.conf
> +
> +# finalize the init script
> +INIT_PATH="${TARGET_DIR}/sbin/init"
> +sed -i "/^# Clear memory to reduce page fragmentation/d" "${INIT_PATH}"
> +sed -i "/^echo 3 > \/proc\/sys\/vm\/drop_caches/d" "${INIT_PATH}"

Meh, this kind of sucks. tinyinit does one thing and we have to undo it
here. Not great. Can we do better, i.e decide whether it makes sense to
do it or not? To be honest, I am not sure if this is really useful to
do at boot time.


> diff --git a/configs/stm32f746_disco_sd_defconfig b/configs/stm32f746_disco_sd_defconfig
> new file mode 100644
> index 000000000000..8c92afc5740e
> --- /dev/null
> +++ b/configs/stm32f746_disco_sd_defconfig
> @@ -0,0 +1,32 @@
> +BR2_arm=y
> +BR2_cortex_m7=y
> +BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
> +BR2_GLOBAL_PATCH_DIR="board/stmicroelectronics/stm32f746-disco/patches"
> +BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
> +BR2_INIT_NONE=y
> +BR2_ROOTFS_POST_BUILD_SCRIPT="board/stmicroelectronics/stm32f746-disco/post-build.sh"
> +BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
> +BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/stmicroelectronics/stm32f746-disco/genimage.cfg"
> +BR2_LINUX_KERNEL=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15.165"
> +BR2_LINUX_KERNEL_DEFCONFIG="stm32"
> +BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/stmicroelectronics/stm32f746-disco/linux.fragment"
> +BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
> +BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="zImage"
> +BR2_LINUX_KERNEL_DTS_SUPPORT=y
> +BR2_LINUX_KERNEL_INTREE_DTS_NAME="stm32f746-disco"
> +BR2_PACKAGE_TINYINIT=y
> +BR2_TARGET_ROOTFS_EXT2=y
> +BR2_TARGET_ROOTFS_EXT2_SIZE="32M"
> +# BR2_TARGET_ROOTFS_TAR is not set
> +BR2_TARGET_UBOOT=y
> +BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
> +BR2_TARGET_UBOOT_CUSTOM_VERSION=y
> +BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2024.07"
> +BR2_TARGET_UBOOT_BOARD_DEFCONFIG="stm32f746-disco"
> +BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
> +BR2_PACKAGE_HOST_DOSFSTOOLS=y
> +BR2_PACKAGE_HOST_GENIMAGE=y
> +BR2_PACKAGE_HOST_MTOOLS=y
> +BR2_PACKAGE_HOST_OPENOCD=y

If you drop the FAT partition, you can drop BR2_PACKAGE_HOST_MTOOLS=y
and BR2_PACKAGE_HOST_DOSFSTOOLS=y.

Thanks!

Thomas
Dario Binacchi Aug. 25, 2024, 3:23 p.m. UTC | #2 
Hello Thomas,

On Fri, Aug 23, 2024 at 6:20 PM Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
>
> Hello,
>
> On Thu, 22 Aug 2024 20:37:41 +0200
> Dario Binacchi <dario.binacchi@amarulasolutions.com> wrote:
>
> > diff --git a/board/stmicroelectronics/stm32f746-disco/flash_sd.sh b/board/stmicroelectronics/stm32f746-disco/flash_sd.sh
> > new file mode 100755
> > index 000000000000..4fe85448f984
> > --- /dev/null
> > +++ b/board/stmicroelectronics/stm32f746-disco/flash_sd.sh
> > @@ -0,0 +1,22 @@
> > +#!/bin/bash
> > +
> > +if [ $# -eq 0 ]; then
> > +    OUTPUT_DIR=output
> > +else
> > +    OUTPUT_DIR=$1
> > +fi
> > +
> > +if ! test -d "${OUTPUT_DIR}" ; then
> > +    echo "ERROR: no output directory specified."
> > +    echo "Usage: $0 OUTPUT_DIR"
> > +    exit 1
> > +fi
> > +
> > +"${OUTPUT_DIR}"/host/bin/openocd -f board/stm32f746g-disco.cfg \
> > +  -c "init" \
> > +  -c "reset init" \
> > +  -c "flash probe 0" \
> > +  -c "flash info 0" \
> > +  -c "flash write_image erase ${OUTPUT_DIR}/images/u-boot.bin 0x08000000" \
> > +  -c "reset run" \
> > +  -c "shutdown"
>
> Could you keep the indentation consistent? Above you used 4 spaces, and
> here only 2.

You are right. Sorry.

>
> > diff --git a/board/stmicroelectronics/stm32f746-disco/genimage.cfg b/board/stmicroelectronics/stm32f746-disco/genimage.cfg
> > new file mode 100644
> > index 000000000000..6743d41972c0
> > --- /dev/null
> > +++ b/board/stmicroelectronics/stm32f746-disco/genimage.cfg
> > @@ -0,0 +1,27 @@
> > +image boot.vfat {
> > +     vfat {
> > +             files = {
> > +                     "zImage",
> > +                     "stm32f746-disco.dtb",
> > +                     "extlinux"
> > +             }
> > +     }
> > +
> > +     size = 16M
> > +}
> > +
> > +image sdcard.img {
> > +     hdimage {
> > +     }
> > +
> > +     partition u-boot {
>
> Why is this partition called u-boot? It doesn't contain anything u-boot
> related.
>
> > +             partition-type = 0xC
> > +             image = "boot.vfat"
>
> But why is a VFAT partition needed in fact? Why can't U-Boot simply get
> the kernel+DTB from the ext4 rootfs partition?

I ran some tests with a single partition, as you suggested, but the system
became less stable. Even with just an `ls` command, I encountered issues
with the device, whereas with two partitions, I can execute more commands
before running into problems.
The memory fragmentation has likely increased.
So I would therefore prefer to keep the two-partition system.

As Waldemar suggested:
https://lore.kernel.org/buildroot/20230930223622.06e32f3c@windsurf/T/
I'd be curious to see the stability with FDPIC support.
But that's another story :)

>
>
> > diff --git a/board/stmicroelectronics/stm32f746-disco/post-build.sh b/board/stmicroelectronics/stm32f746-disco/post-build.sh
> > new file mode 100755
> > index 000000000000..2894ad851c66
> > --- /dev/null
> > +++ b/board/stmicroelectronics/stm32f746-disco/post-build.sh
> > @@ -0,0 +1,9 @@
> > +#!/bin/sh
> > +BOARD_DIR="$(dirname "$0")"
> > +
> > +install -m 0644 -D "${BOARD_DIR}"/extlinux.conf "${BINARIES_DIR}"/extlinux/extlinux.conf
> > +
> > +# finalize the init script
> > +INIT_PATH="${TARGET_DIR}/sbin/init"
> > +sed -i "/^# Clear memory to reduce page fragmentation/d" "${INIT_PATH}"
> > +sed -i "/^echo 3 > \/proc\/sys\/vm\/drop_caches/d" "${INIT_PATH}"
>
> Meh, this kind of sucks. tinyinit does one thing and we have to undo it
> here. Not great. Can we do better, i.e decide whether it makes sense to
> do it or not? To be honest, I am not sure if this is really useful to
> do at boot time.

I think it's better to remove those instructions from "post-build.sh"
to ensure functional
backward compatibility with the boards from which the script was borrowed.

Thanks and regards,
Dario

>
>
> > diff --git a/configs/stm32f746_disco_sd_defconfig b/configs/stm32f746_disco_sd_defconfig
> > new file mode 100644
> > index 000000000000..8c92afc5740e
> > --- /dev/null
> > +++ b/configs/stm32f746_disco_sd_defconfig
> > @@ -0,0 +1,32 @@
> > +BR2_arm=y
> > +BR2_cortex_m7=y
> > +BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
> > +BR2_GLOBAL_PATCH_DIR="board/stmicroelectronics/stm32f746-disco/patches"
> > +BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
> > +BR2_INIT_NONE=y
> > +BR2_ROOTFS_POST_BUILD_SCRIPT="board/stmicroelectronics/stm32f746-disco/post-build.sh"
> > +BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
> > +BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/stmicroelectronics/stm32f746-disco/genimage.cfg"
> > +BR2_LINUX_KERNEL=y
> > +BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> > +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15.165"
> > +BR2_LINUX_KERNEL_DEFCONFIG="stm32"
> > +BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/stmicroelectronics/stm32f746-disco/linux.fragment"
> > +BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
> > +BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="zImage"
> > +BR2_LINUX_KERNEL_DTS_SUPPORT=y
> > +BR2_LINUX_KERNEL_INTREE_DTS_NAME="stm32f746-disco"
> > +BR2_PACKAGE_TINYINIT=y
> > +BR2_TARGET_ROOTFS_EXT2=y
> > +BR2_TARGET_ROOTFS_EXT2_SIZE="32M"
> > +# BR2_TARGET_ROOTFS_TAR is not set
> > +BR2_TARGET_UBOOT=y
> > +BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
> > +BR2_TARGET_UBOOT_CUSTOM_VERSION=y
> > +BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2024.07"
> > +BR2_TARGET_UBOOT_BOARD_DEFCONFIG="stm32f746-disco"
> > +BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
> > +BR2_PACKAGE_HOST_DOSFSTOOLS=y
> > +BR2_PACKAGE_HOST_GENIMAGE=y
> > +BR2_PACKAGE_HOST_MTOOLS=y
> > +BR2_PACKAGE_HOST_OPENOCD=y
>
> If you drop the FAT partition, you can drop BR2_PACKAGE_HOST_MTOOLS=y
> and BR2_PACKAGE_HOST_DOSFSTOOLS=y.
>
> Thanks!
>
> Thomas
> --
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com
diff mbox series

Patch

diff --git a/DEVELOPERS b/DEVELOPERS
index 45cc1cc48996..e8dc27f7ad47 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -785,10 +785,12 @@  F:	package/xinetd/
 
 N:	Dario Binacchi <dario.binacchi@amarulasolutions.com>
 F:	board/bsh/
+F:	board/stmicroelectronics/stm32f746-disco/
 F:	board/stmicroelectronics/stm32f769-disco/
 F:	configs/imx6ulz_bsh_smm_m2_defconfig
 F:	configs/imx8mn_bsh_smm_s2_defconfig
 F:	configs/imx8mn_bsh_smm_s2_pro_defconfig
+F:	configs/stm32f746_disco_sd_defconfig
 F:	configs/stm32f769_disco_sd_defconfig
 F:	package/sscep/
 F:	package/tinyinit/
diff --git a/board/stmicroelectronics/stm32f746-disco/extlinux.conf b/board/stmicroelectronics/stm32f746-disco/extlinux.conf
new file mode 100644
index 000000000000..bb79c0b412a2
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/extlinux.conf
@@ -0,0 +1,4 @@ 
+label stm32f746-disco-buildroot
+  kernel /zImage
+  devicetree /stm32f746-disco.dtb
+  append console=ttySTM0,115200 root=/dev/mmcblk0p2 rw rootwait consoleblank=0 ignore_loglevel
diff --git a/board/stmicroelectronics/stm32f746-disco/flash_sd.sh b/board/stmicroelectronics/stm32f746-disco/flash_sd.sh
new file mode 100755
index 000000000000..4fe85448f984
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/flash_sd.sh
@@ -0,0 +1,22 @@ 
+#!/bin/bash
+
+if [ $# -eq 0 ]; then
+    OUTPUT_DIR=output
+else
+    OUTPUT_DIR=$1
+fi
+
+if ! test -d "${OUTPUT_DIR}" ; then
+    echo "ERROR: no output directory specified."
+    echo "Usage: $0 OUTPUT_DIR"
+    exit 1
+fi
+
+"${OUTPUT_DIR}"/host/bin/openocd -f board/stm32f746g-disco.cfg \
+  -c "init" \
+  -c "reset init" \
+  -c "flash probe 0" \
+  -c "flash info 0" \
+  -c "flash write_image erase ${OUTPUT_DIR}/images/u-boot.bin 0x08000000" \
+  -c "reset run" \
+  -c "shutdown"
diff --git a/board/stmicroelectronics/stm32f746-disco/genimage.cfg b/board/stmicroelectronics/stm32f746-disco/genimage.cfg
new file mode 100644
index 000000000000..6743d41972c0
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/genimage.cfg
@@ -0,0 +1,27 @@ 
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"stm32f746-disco.dtb",
+			"extlinux"
+		}
+	}
+
+	size = 16M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot {
+		partition-type = 0xC
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext2"
+		size = 32M
+	}
+}
diff --git a/board/stmicroelectronics/stm32f746-disco/linux.fragment b/board/stmicroelectronics/stm32f746-disco/linux.fragment
new file mode 100644
index 000000000000..625fdced9e8d
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/linux.fragment
@@ -0,0 +1,13 @@ 
+# CONFIG_PREEMPT is not set
+# CONFIG_MULTIUSER is not set
+# CONFIG_TIMERFD is not set
+CONFIG_SET_MEM_PARAM=y
+CONFIG_DRAM_BASE=0xC0000000
+CONFIG_DRAM_SIZE=0x01000000
+# CONFIG_GCC_PLUGINS is not set
+# CONFIG_XIP_KERNEL is not set
+# CONFIG_BLK_DEV is not set
+# CONFIG_COMPAT_BRK is not set
+# CONFIG_PROC_SYSCTL is not set
+# CONFIG_CRYPTO is not set
+CONFIG_RCU_TRACE=y
\ No newline at end of file
diff --git a/board/stmicroelectronics/stm32f746-disco/patches/linux-headers/linux-headers.hash b/board/stmicroelectronics/stm32f746-disco/patches/linux-headers/linux-headers.hash
new file mode 120000
index 000000000000..5808d92afe89
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/patches/linux-headers/linux-headers.hash
@@ -0,0 +1 @@ 
+../linux/linux.hash
\ No newline at end of file
diff --git a/board/stmicroelectronics/stm32f746-disco/patches/linux/linux.hash b/board/stmicroelectronics/stm32f746-disco/patches/linux/linux.hash
new file mode 100644
index 000000000000..7f78b950f35c
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/patches/linux/linux.hash
@@ -0,0 +1,2 @@ 
+# Locally calculated
+sha256  a36dd3e82ceb634afded31f2656568f57c4d9c4b399859f298b18116df11c6fe  linux-5.15.165.tar.xz
diff --git a/board/stmicroelectronics/stm32f746-disco/patches/uboot/uboot.hash b/board/stmicroelectronics/stm32f746-disco/patches/uboot/uboot.hash
new file mode 100644
index 000000000000..fe9b4f53dc63
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/patches/uboot/uboot.hash
@@ -0,0 +1,2 @@ 
+# Locally calculated
+sha256  f591da9ab90ef3d6b3d173766d0ddff90c4ed7330680897486117df390d83c8f  u-boot-2024.07.tar.bz2
diff --git a/board/stmicroelectronics/stm32f746-disco/post-build.sh b/board/stmicroelectronics/stm32f746-disco/post-build.sh
new file mode 100755
index 000000000000..2894ad851c66
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/post-build.sh
@@ -0,0 +1,9 @@ 
+#!/bin/sh
+BOARD_DIR="$(dirname "$0")"
+
+install -m 0644 -D "${BOARD_DIR}"/extlinux.conf "${BINARIES_DIR}"/extlinux/extlinux.conf
+
+# finalize the init script
+INIT_PATH="${TARGET_DIR}/sbin/init"
+sed -i "/^# Clear memory to reduce page fragmentation/d" "${INIT_PATH}"
+sed -i "/^echo 3 > \/proc\/sys\/vm\/drop_caches/d" "${INIT_PATH}"
diff --git a/board/stmicroelectronics/stm32f746-disco/readme.txt b/board/stmicroelectronics/stm32f746-disco/readme.txt
new file mode 100644
index 000000000000..4ac16da33132
--- /dev/null
+++ b/board/stmicroelectronics/stm32f746-disco/readme.txt
@@ -0,0 +1,31 @@ 
+STM32F746-DISCO
+===================
+
+This tutorial describes how to use the predefined Buildroot
+configuration for the STM32F746-DISCO evaluation platform.
+
+Building
+--------
+
+  make stm32f746_disco_sd_defconfig
+  make
+
+Flashing
+--------
+
+  ./board/stmicroelectronics/stm32f746-disco/flash_sd.sh output/
+
+It will flash the U-boot bootloader.
+
+Creating SD card
+----------------
+
+Buildroot prepares an "sdcard.img" image in the output/images/ directory,
+ready to be dumped on a SD card. Launch the following command as root:
+
+  dd if=output/images/sdcard.img of=/dev/<your-sd-device>
+
+*** WARNING! This will destroy all the card content. Use with care! ***
+
+For details about the medium image layout and its content, see the
+definition in board/stmicroelectronics/stm32f746-disco/genimage.cfg.
diff --git a/configs/stm32f746_disco_sd_defconfig b/configs/stm32f746_disco_sd_defconfig
new file mode 100644
index 000000000000..8c92afc5740e
--- /dev/null
+++ b/configs/stm32f746_disco_sd_defconfig
@@ -0,0 +1,32 @@ 
+BR2_arm=y
+BR2_cortex_m7=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
+BR2_GLOBAL_PATCH_DIR="board/stmicroelectronics/stm32f746-disco/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_INIT_NONE=y
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/stmicroelectronics/stm32f746-disco/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/stmicroelectronics/stm32f746-disco/genimage.cfg"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15.165"
+BR2_LINUX_KERNEL_DEFCONFIG="stm32"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/stmicroelectronics/stm32f746-disco/linux.fragment"
+BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
+BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="zImage"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="stm32f746-disco"
+BR2_PACKAGE_TINYINIT=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="32M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2024.07"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="stm32f746-disco"
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_HOST_OPENOCD=y