Add litex buildroot tuto (wip)

doc/litex/buildroot/Config.in

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+source "$BR2_EXTERNAL_LITEX_SOC_PATH/package/dhrystone-opt/Config.in"
+
+

doc/litex/buildroot/README.md

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+export WORK_DIR=$PWD
+
+git clone https://github.com/SpinalHDL/VexiiRiscv
+export VEXII=$PWD/VexiiRiscv
+
+git clone http://github.com/buildroot/buildroot
+cd buildroot
+make O=build/basic  BR2_EXTERNAL=$VEXII/doc/litex/buildroot litex_soc_basic_defconfig
+(cd build/basic/ && make -j$(nproc))
+
+python3 -m litex_boards.targets.digilent_nexys_video --cpu-type=vexiiriscv --cpu-variant=debian  --bus-standard axi-lite \
+--cpu-count=1 --with-video-framebuffer --with-sdcard --with-ethernet --with-coherent-dma  \
+--soc-json build/csr.json --build

doc/litex/buildroot/board/litex_soc/linux.config

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+CONFIG_SECTION_MISMATCH_WARN_ONLY=y
+
+# Architecture
+CONFIG_ARCH_DEFCONFIG="arch/riscv/configs/defconfig"
+CONFIG_NONPORTABLE=y
+CONFIG_ARCH_RV32I=y
+CONFIG_RISCV_ISA_M=y
+CONFIG_RISCV_ISA_A=y
+CONFIG_RISCV_ISA_C=n
+CONFIG_SIFIVE_PLIC=y
+CONFIG_FPU=n
+CONFIG_SMP=y
+CONFIG_STRICT_KERNEL_RWX=n
+CONFIG_EFI=n
+CONFIG_RISCV_SBI_V01=y
+CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
+CONFIG_HVC_RISCV_SBI=y
+
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_RD_GZIP=y
+CONFIG_RD_BZIP2=y
+CONFIG_RD_LZMA=y
+CONFIG_RD_XZ=y
+CONFIG_RD_LZO=y
+CONFIG_RD_LZ4=y
+
+# FPGA / SoC
+CONFIG_FPGA=y
+CONFIG_FPGA_MGR_LITEX=y
+CONFIG_LITEX_SOC_CONTROLLER=y
+CONFIG_LITEX_SUBREG_SIZE=4
+
+# Time
+CONFIG_PRINTK_TIME=y
+
+# Clocking
+CONFIG_COMMON_CLK=y
+CONFIG_COMMON_CLK_LITEX=y
+
+# Interrupts
+CONFIG_IRQCHIP=y
+CONFIG_OF_IRQ=y
+CONFIG_HANDLE_DOMAIN_IRQ=y
+CONFIG_LITEX_SOC_INTC=y
+
+# Ethernet
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_PACKET_DIAG=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_NETDEVICES=y
+CONFIG_NET_VENDOR_LITEX=y
+CONFIG_LITEX_LITEETH=y
+
+# Serial
+CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
+CONFIG_SERIAL_LITEUART=y
+CONFIG_SERIAL_LITEUART_CONSOLE=y
+
+# GPIO
+CONFIG_GPIO_SYSFS=y
+CONFIG_GPIOLIB=y
+CONFIG_GPIO_LITEX=y
+
+# PWM
+CONFIG_PWM=y
+CONFIG_PWM_LITEX=y
+
+# SPI
+CONFIG_SPI=y
+CONFIG_SPI_LITESPI=y
+CONFIG_SPI_SPIDEV=y
+
+# I2C
+CONFIG_I2C=y
+CONFIG_I2C_LITEX=y
+CONFIG_I2C_CHARDEV=y
+
+# Hardware monitoring
+CONFIG_HWMON=y
+CONFIG_SENSORS_LITEX_HWMON=y
+
+# Framebuffer
+CONFIG_FB=y
+CONFIG_FB_SIMPLE=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
+CONFIG_LOGO=y
+CONFIG_DRM=y
+CONFIG_DRM_LITEVIDEO=y
+
+# Flash
+CONFIG_MTD=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_SPI_FLASH_LITEX=y
+
+# MMC
+CONFIG_MMC=y
+CONFIG_MMC_SPI=y
+CONFIG_MMC_LITEX=y
+
+CONFIG_EXT2_FS=y
+CONFIG_EXT3_FS=y
+CONFIG_EXT4_FS=y
+
+# .config in kernel
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+
+# Filesystem
+CONFIG_FAT_FS=y
+CONFIG_MSDOS_FS=y
+CONFIG_MSDOS_PARTITION=y
+CONFIG_VFAT_FS=y
+CONFIG_FAT_DEFAULT_CODEPAGE=437
+CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
+CONFIG_NCPFS_SMALLDOS=y
+CONFIG_NLS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ASCII=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_TMPFS=y
+
+# USB
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_USB_AUDIO=y
+CONFIG_USB_HIDDEV=y
+CONFIG_USB_LED_TRIG=y
+CONFIG_USB=y
+CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_HCD_PLATFORM=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_SERIAL=y
+CONFIG_USB_SERIAL_FTDI_SIO=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_AUDIO=y
+
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SD=y
+
+CONFIG_INPUT_MOUSEDEV=y
+CONFIG_INPUT_MOUSEDEV_PSAUX=y
+CONFIG_INPUT_EVDEV=y
+
+# USB wireless support
+CONFIG_WLAN=y
+CONFIG_WIRELESS=y
+CONFIG_USB_NET_DRIVERS=y
+CONFIG_WLAN_VENDOR_REALTEK=y
+CONFIG_RTL8XXXU=y
+CONFIG_MAC80211=y
+CONFIG_CRYPTO=y

doc/litex/buildroot/board/litex_soc/rootfs_overlay/etc/X11/xorg.conf

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+Section "Module"
+  Load "fb"
+  Load "shadow"
+  Load "fbdevhw"
+EndSection

doc/litex/buildroot/board/litex_soc/rootfs_overlay/etc/profile

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+export PATH="/bin:/sbin:/usr/bin:/usr/sbin"
+
+if [ "$PS1" ]; then
+	if [ "`id -u`" -eq 0 ]; then
+		export PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\# '
+	else
+		export PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
+	fi
+fi
+
+export PAGER='/bin/more'
+export EDITOR='/bin/vi'
+
+# Source configuration files from /etc/profile.d
+for i in /etc/profile.d/*.sh ; do
+	if [ -r "$i" ]; then
+		. $i
+	fi
+done
+unset i

doc/litex/buildroot/board/litex_vexriscv_usbhost/linux.config

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+CONFIG_SECTION_MISMATCH_WARN_ONLY=y
+
+# Architecture
+CONFIG_ARCH_DEFCONFIG="arch/riscv/configs/defconfig"
+CONFIG_NONPORTABLE=y
+CONFIG_ARCH_RV32I=y
+CONFIG_RISCV_ISA_M=y
+CONFIG_RISCV_ISA_A=y
+CONFIG_RISCV_ISA_C=n
+CONFIG_SIFIVE_PLIC=y
+CONFIG_FPU=n
+CONFIG_SMP=y
+CONFIG_STRICT_KERNEL_RWX=n
+CONFIG_EFI=n
+CONFIG_HVC_RISCV_SBI=y
+
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_RD_GZIP=y
+CONFIG_RD_BZIP2=y
+CONFIG_RD_LZMA=y
+CONFIG_RD_XZ=y
+CONFIG_RD_LZO=y
+CONFIG_RD_LZ4=y
+
+# FPGA / SoC
+CONFIG_FPGA=y
+CONFIG_FPGA_MGR_LITEX=y
+CONFIG_LITEX_SOC_CONTROLLER=y
+CONFIG_LITEX_SUBREG_SIZE=4
+
+# Time
+CONFIG_PRINTK_TIME=y
+
+# Clocking
+CONFIG_COMMON_CLK=y
+CONFIG_COMMON_CLK_LITEX=y
+
+# Interrupts
+CONFIG_IRQCHIP=y
+CONFIG_OF_IRQ=y
+CONFIG_HANDLE_DOMAIN_IRQ=y
+CONFIG_LITEX_SOC_INTC=y
+
+# Ethernet
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_PACKET_DIAG=y
+CONFIG_INET=y
+CONFIG_NETDEVICES=y
+CONFIG_NET_VENDOR_LITEX=y
+CONFIG_LITEX_LITEETH=y
+
+# Serial
+CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
+CONFIG_SERIAL_LITEUART=y
+CONFIG_SERIAL_LITEUART_CONSOLE=y
+
+# GPIO
+CONFIG_GPIO_SYSFS=y
+CONFIG_GPIOLIB=y
+CONFIG_GPIO_LITEX=y
+
+# PWM
+CONFIG_PWM=y
+CONFIG_PWM_LITEX=y
+
+# SPI
+CONFIG_SPI=y
+CONFIG_SPI_LITESPI=y
+CONFIG_SPI_SPIDEV=y
+
+# I2C
+CONFIG_I2C=y
+CONFIG_I2C_LITEX=y
+CONFIG_I2C_CHARDEV=y
+
+# Hardware monitoring
+CONFIG_HWMON=y
+CONFIG_SENSORS_LITEX_HWMON=y
+
+# Framebuffer
+CONFIG_FB=y
+CONFIG_FB_SIMPLE=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
+CONFIG_LOGO=y
+CONFIG_DRM=y
+CONFIG_DRM_LITEVIDEO=y
+
+# Flash
+CONFIG_MTD=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_SPI_FLASH_LITEX=y
+
+# MMC
+CONFIG_MMC=y
+CONFIG_MMC_SPI=y
+CONFIG_MMC_LITEX=y
+
+CONFIG_EXT2_FS=y
+CONFIG_EXT3_FS=y
+CONFIG_EXT4_FS=y
+
+# .config in kernel
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+
+# Filesystem
+CONFIG_FAT_FS=y
+CONFIG_MSDOS_FS=y
+CONFIG_MSDOS_PARTITION=y
+CONFIG_VFAT_FS=y
+CONFIG_FAT_DEFAULT_CODEPAGE=437
+CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
+CONFIG_NCPFS_SMALLDOS=y
+CONFIG_NLS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ASCII=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_TMPFS=y
+
+# USB
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_USB_AUDIO=y
+CONFIG_USB_HIDDEV=y
+CONFIG_USB_LED_TRIG=y
+CONFIG_USB=y
+CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_HCD_PLATFORM=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_SERIAL=y
+CONFIG_USB_SERIAL_FTDI_SIO=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_AUDIO=y
+
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SD=y
+
+CONFIG_INPUT_MOUSEDEV=y
+CONFIG_INPUT_MOUSEDEV_PSAUX=y
+CONFIG_INPUT_EVDEV=y
+
+# USB wireless support
+CONFIG_WLAN=y
+CONFIG_WIRELESS=y
+CONFIG_USB_NET_DRIVERS=y
+CONFIG_WLAN_VENDOR_REALTEK=y
+CONFIG_RTL8XXXU=y
+CONFIG_MAC80211=y
+CONFIG_CRYPTO=y

doc/litex/buildroot/board/litex_vexriscv_usbhost/rootfs_overlay/etc/inittab

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+# /etc/inittab
+#
+# Copyright (C) 2001 Erik Andersen <andersen@codepoet.org>
+#
+# Note: BusyBox init doesn't support runlevels.  The runlevels field is
+# completely ignored by BusyBox init. If you want runlevels, use
+# sysvinit.
+#
+# Format for each entry: <id>:<runlevels>:<action>:<process>
+#
+# id        == tty to run on, or empty for /dev/console
+# runlevels == ignored
+# action    == one of sysinit, respawn, askfirst, wait, and once
+# process   == program to run
+
+# Startup the system
+::sysinit:/bin/mount -t proc proc /proc
+::sysinit:/bin/mount -o remount,rw /
+::sysinit:/bin/mkdir -p /dev/pts /dev/shm
+::sysinit:/bin/mount -a
+::sysinit:/bin/mkdir -p /run/lock/subsys
+::sysinit:/sbin/swapon -a
+null::sysinit:/bin/ln -sf /proc/self/fd /dev/fd
+null::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin
+null::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout
+null::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr
+::sysinit:/bin/hostname -F /etc/hostname
+# now run any rc scripts
+::sysinit:/etc/init.d/rcS
+
+# Put a getty on the serial port
+console::respawn:/sbin/getty -L  console 0 vt100 # GENERIC_SERIAL
+
+# Put a getty on the current virtual terminal
+::respawn:/sbin/getty -L 115200 tty0
+
+# Stuff to do for the 3-finger salute
+#::ctrlaltdel:/sbin/reboot
+
+# Stuff to do before rebooting
+::shutdown:/etc/init.d/rcK
+::shutdown:/sbin/swapoff -a
+::shutdown:/bin/umount -a -r