initial buildroot for linux 5.15

board/minnowboard/fs-overlay-graphical/etc/X11/Xsession

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+# Start a terminal on the top left corner
+xterm -geom 80x30+0+0 &
+
+# OpenGL demo
+glmark2 &
+
+exec /usr/bin/openbox-session

board/minnowboard/fs-overlay-graphical/etc/X11/xorg.conf.d/01-modules.conf

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+
+# Xorg does not implement real dynamic linking and requires that its
+# modules get loaded in the right order.
+# https://forums.gentoo.org/viewtopic-p-8245578.html#8245578
+Section "Module"
+   Load "vgahw"
+   Load "fb"
+   Load "shadowfb"
+   Load "int10"
+   Load "vbe"
+EndSection

board/minnowboard/fs-overlay-graphical/etc/asound.conf

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+# Customize ALSA:
+# the HDMI PCM is at card=0, device=3 (i.e. hw:0,3)
+defaults.pcm.card 0
+defaults.pcm.device 3

board/minnowboard/genimage.cfg

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+# Create an image of the efi partition
+image efi-part.vfat {
+	vfat {
+		file EFI {
+			image = "efi-part/EFI"
+		}
+		file bzImage {
+			image = "bzImage"
+		}
+	}
+
+	size=10M
+}
+
+# Create the sdcard image, pulling in
+#  * the image created by buildroot
+#  * the efi-partition created above
+image sdcard.img {
+	hdimage {
+		gpt = true
+	}
+
+	partition boot {
+		partition-type-uuid = U
+		image = "efi-part.vfat"
+	}
+
+	partition rootfs {
+		partition-type-uuid = L
+		image = "rootfs.ext4"
+		size = 512M
+	}
+}

board/minnowboard/grub.cfg

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+set default="0"
+set timeout="5"
+
+menuentry "Buildroot" {
+	linux /bzImage root=PARTLABEL=rootfs rootwait console=tty0 console=ttyS0,115200 net.ifnames=0
+}

board/minnowboard/linux.config

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+CONFIG_SYSVIPC=y
+CONFIG_NO_HZ=y
+CONFIG_SMP=y
+CONFIG_X86_INTEL_LPSS=y
+CONFIG_MATOM=y
+CONFIG_EFI=y
+CONFIG_CPU_FREQ=y
+CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+CONFIG_X86_INTEL_PSTATE=y
+CONFIG_X86_ACPI_CPUFREQ=y
+CONFIG_INTEL_IDLE=y
+CONFIG_IA32_EMULATION=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_PCI=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_CHR_DEV_SG=y
+CONFIG_ATA=y
+CONFIG_SATA_AHCI=y
+CONFIG_ATA_PIIX=y
+CONFIG_NETDEVICES=y
+CONFIG_R8169=y
+CONFIG_IGB=y
+CONFIG_INPUT_EVDEV=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_DW=y
+CONFIG_I2C_I801=y
+CONFIG_I2C_DESIGNWARE_PLATFORM=y
+CONFIG_I2C_DESIGNWARE_PCI=y
+CONFIG_SPI=y
+CONFIG_SPI_DESIGNWARE=y
+CONFIG_SPI_PXA2XX=y
+CONFIG_PINCTRL_BAYTRAIL=y
+CONFIG_GPIOLIB=y
+CONFIG_GPIO_SYSFS=y
+CONFIG_AGP=y
+CONFIG_DRM=y
+CONFIG_DRM_LOAD_EDID_FIRMWARE=y
+CONFIG_DRM_I915=y
+CONFIG_SOUND=y
+CONFIG_SND=y
+# CONFIG_SND_DRIVERS is not set
+CONFIG_SND_HDA_INTEL=y
+CONFIG_SND_HDA_CODEC_HDMI=y
+# CONFIG_SND_SPI is not set
+# CONFIG_SND_USB is not set
+CONFIG_USB=y
+CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_NOP_USB_XCEIV=y
+CONFIG_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_PCI=y
+CONFIG_MMC_SDHCI_ACPI=y
+CONFIG_PWM=y
+CONFIG_EXT4_FS=y
+CONFIG_UNWINDER_FRAME_POINTER=y

board/minnowboard/post-build.sh

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+#!/bin/sh
+
+cp -v board/minnowboard/grub.cfg ${BINARIES_DIR}/efi-part/EFI/BOOT/grub.cfg
+
+# Add a console on tty1
+if [ -e ${TARGET_DIR}/etc/inittab ]; then
+    grep -qE '^tty1::' ${TARGET_DIR}/etc/inittab || \
+	sed -i '/GENERIC_SERIAL/a\
+tty1::respawn:/sbin/getty -L  tty1 0 vt100 # HDMI console' ${TARGET_DIR}/etc/inittab
+fi

board/minnowboard/readme.txt

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+How to get started with the MinnowBoard MAX
+===========================================
+
+1. Build
+
+  Apply the defconfig:
+
+  $ make minnowboard_max_defconfig
+
+  Add any additional packages required and build:
+
+  $ make
+
+2. Write the SD card
+
+  The build process will create a SD card image in output/images.
+  Write the image to an mSD card, insert into the MinnowBoard MAX
+  and power the board on.
+
+  $ dd if=output/images/sdcard.img of=/dev/mmcblk0; sync
+
+  The system starts two consoles: one on the serial port
+  and one on HDMI.
+
+3. Enjoy
+
+Additional information about this board can be found at
+http://www.minnowboard.org/.