RPi: enable building a device-tree-enabled kernel (branch yem/rpi-dt)
v3 cover RPi: enable building a device-tree-enabled kernel (branch yem/rpi-dt)
Hello All!
This series completes support for a Device-Tree-enabled Raspberry Pi:
- introduce a new defconfig file,
- update the board documentation.
Changes v2 -> v3:
- bundle our own Linux defconfig (Thomas)
- build our own toolchain (Thomas)
- drop patches already applied (Thomas)
Regards,
Yann E. MORIN.
The following changes since commit 0ae1ab3ed51ff2368767b4d8b163a5da7011a8b4:
openntpd: bump to version 5.7p1 (2015-01-10 13:17:38 +0100)
are available in the git repository at:
git://git.busybox.net/~ymorin/git/buildroot yem/rpi-dt
for you to fetch changes up to 8a8fae5cc4323365edbf7c8e7ceb98e76ac547ef:
boards/raspberrypi: update readme with Device Tree instructions (2015-01-10 13:48:31 +0100)
----------------------------------------------------------------
Yann E. MORIN (2):
configs: add a DT-enabled Raspberry Pi defconfig boards/raspberrypi: update readme with Device Tree instructions
board/raspberrypi/linux-3.18-rpi-dt.defconfig | 204 ++++++++++++++++++++++++++ board/raspberrypi/readme.txt | 31 +++- configs/raspberrypi_dt_defconfig | 12 ++ 3 files changed, 243 insertions(+), 4 deletions(-) create mode 100644 board/raspberrypi/linux-3.18-rpi-dt.defconfig create mode 100644 configs/raspberrypi_dt_defconfig
Signature · 6 lines
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PATCH v3 1/2 configs: add a DT-enabled Raspberry Pi defconfig
This is an example of a Device-Tree-enabled Raspberry Pi defconfig.
We have to use a 3.18-based kernel for that, but there are a few limitations:
- we can not use the minimalist RPi defconfig bundled with the kernel, namely bcmrpi_quick_defconfig, because it is not DT-enabled, and sets CONFIG_ARM_PATCH_PHYS_VIRT to 'n', which prompts a value for CONFIG_PHYS_OFFSET, as it as no default for the bcm familly;
- most importantly, the rpi-3.18.y branch is constantly rebased, so there is no guarantee that the sha1 I use today will still be usable in the long term. Using the name of hte branch is not better either.
So, we bundle our own DT-enabled linux defconfig that is based on bcmrpi_quick_defconfig, with just CONFIG_ARM_PATCH_PHYS_VIRT set and the Device TRee enabled.
Signed-off-by "Yann E. MORIN" <[email protected]>
--- board/raspberrypi/linux-3.18-rpi-dt.defconfig | 204 ++++++++++++++++++++++++++ configs/raspberrypi_dt_defconfig | 12 ++ 2 files changed, 216 insertions(+) create mode 100644 board/raspberrypi/linux-3.18-rpi-dt.defconfig create mode 100644 configs/raspberrypi_dt_defconfig
board/raspberrypi/linux-3.18-rpi-dt.defconfig new file +204 -0
@@ -0,0 +1,204 @@ +# CONFIG_LOCALVERSION_AUTO is not set +CONFIG_KERNEL_XZ=y +# CONFIG_SWAP is not set +CONFIG_SYSVIPC=y +CONFIG_POSIX_MQUEUE=y +CONFIG_FHANDLE=y +CONFIG_NO_HZ_IDLE=y +CONFIG_HIGH_RES_TIMERS=y +CONFIG_IKCONFIG=m +CONFIG_IKCONFIG_PROC=y +CONFIG_LOG_BUF_SHIFT=21 +# CONFIG_UTS_NS is not set +# CONFIG_IPC_NS is not set +# CONFIG_PID_NS is not set +# CONFIG_NET_NS is not set +CONFIG_RELAY=y +# CONFIG_COMPAT_BRK is not set +CONFIG_JUMP_LABEL=y +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +# CONFIG_BLK_DEV_BSG is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_IOSCHED_CFQ is not set +CONFIG_ARCH_BCM2708=y +CONFIG_BCM2708_DT=y +CONFIG_PREEMPT=y +CONFIG_AEABI=y +CONFIG_KSM=y +CONFIG_UACCESS_WITH_MEMCPY=y +# CONFIG_ATAGS is not set +CONFIG_KEXEC=y +CONFIG_AUTO_ZRELADDR=y +CONFIG_CPU_FREQ=y +CONFIG_CPU_FREQ_STAT=m +CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE=y +CONFIG_CPU_FREQ_GOV_POWERSAVE=m +CONFIG_CPU_FREQ_GOV_USERSPACE=m +CONFIG_CPU_FREQ_GOV_ONDEMAND=m +CONFIG_VFP=y +CONFIG_BINFMT_MISC=m +# CONFIG_SUSPEND is not set +CONFIG_NET=y +CONFIG_PACKET=y +CONFIG_PACKET_DIAG=m +CONFIG_UNIX=y +CONFIG_UNIX_DIAG=m +CONFIG_INET=y +CONFIG_SYN_COOKIES=y +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_LRO is not set +CONFIG_INET_DIAG=m +CONFIG_INET_UDP_DIAG=m +# CONFIG_IPV6 is not set +CONFIG_NETLINK_DIAG=y +CONFIG_BPF_JIT=y +# CONFIG_WIRELESS is not set +CONFIG_DEVTMPFS=y +CONFIG_DEVTMPFS_MOUNT=y +# CONFIG_FIRMWARE_IN_KERNEL is not set +CONFIG_CONNECTOR=y +CONFIG_BLK_DEV_LOOP=m +CONFIG_BLK_DEV_RAM=m +CONFIG_SCSI=m +# CONFIG_SCSI_PROC_FS is not set +CONFIG_BLK_DEV_SD=m +# CONFIG_SCSI_LOWLEVEL is not set +CONFIG_NETDEVICES=y +CONFIG_DUMMY=m +# CONFIG_ETHERNET is not set +CONFIG_USB_USBNET=m +# CONFIG_USB_NET_AX8817X is not set +# CONFIG_USB_NET_AX88179_178A is not set +# CONFIG_USB_NET_CDCETHER is not set +# CONFIG_USB_NET_CDC_NCM is not set +CONFIG_USB_NET_SMSC95XX=m +# CONFIG_USB_NET_NET1080 is not set +# CONFIG_USB_NET_CDC_SUBSET is not set +# CONFIG_USB_NET_ZAURUS is not set +# CONFIG_WLAN is not set +CONFIG_INPUT_SPARSEKMAP=m +CONFIG_INPUT_EVDEV=m +# CONFIG_INPUT_KEYBOARD is not set +# CONFIG_INPUT_MOUSE is not set +# CONFIG_SERIO is not set +# CONFIG_LEGACY_PTYS is not set +# CONFIG_DEVKMEM is not set +CONFIG_SERIAL_AMBA_PL011=y +CONFIG_SERIAL_AMBA_PL011_CONSOLE=y +CONFIG_HW_RANDOM_BCM2708=m +CONFIG_I2C=m +CONFIG_I2C_CHARDEV=m +CONFIG_I2C_BCM2835=m +CONFIG_I2C_BCM2708=m +CONFIG_SPI=y +CONFIG_SPI_BCM2835=m +CONFIG_SPI_BCM2708=m +CONFIG_SPI_BITBANG=m +CONFIG_GPIO_SYSFS=y +CONFIG_GPIO_GENERIC_PLATFORM=y +# CONFIG_HWMON is not set +CONFIG_THERMAL=y +CONFIG_THERMAL_BCM2835=y +CONFIG_WATCHDOG=y +CONFIG_SOFT_WATCHDOG=m +CONFIG_BCM2708_WDT=m +CONFIG_REGULATOR=y +CONFIG_REGULATOR_FIXED_VOLTAGE=m +CONFIG_REGULATOR_USERSPACE_CONSUMER=m +CONFIG_FB=y +CONFIG_FIRMWARE_EDID=y +CONFIG_FB_MODE_HELPERS=y +CONFIG_FB_BCM2708=y +CONFIG_FRAMEBUFFER_CONSOLE=y +CONFIG_LOGO=y +# CONFIG_LOGO_LINUX_MONO is not set +# CONFIG_LOGO_LINUX_VGA16 is not set +CONFIG_SOUND=m +CONFIG_SND=m +CONFIG_SND_SEQUENCER=m +CONFIG_SND_SEQ_DUMMY=m +CONFIG_SND_MIXER_OSS=m +CONFIG_SND_PCM_OSS=m +CONFIG_SND_SEQUENCER_OSS=y +CONFIG_SND_HRTIMER=m +# CONFIG_SND_SUPPORT_OLD_API is not set +CONFIG_SND_DUMMY=m +CONFIG_SND_BCM2835=m +# CONFIG_SND_SPI is not set +CONFIG_SND_USB_AUDIO=m +CONFIG_HIDRAW=y +CONFIG_UHID=y +CONFIG_HID_PID=y +CONFIG_USB_HIDDEV=y +CONFIG_USB=y +CONFIG_USB_ANNOUNCE_NEW_DEVICES=y +CONFIG_USB_DYNAMIC_MINORS=y +CONFIG_USB_DWCOTG=y +CONFIG_USB_STORAGE=m +CONFIG_USB_STORAGE_REALTEK=m +CONFIG_USB_STORAGE_DATAFAB=m +CONFIG_USB_STORAGE_FREECOM=m +CONFIG_USB_STORAGE_ISD200=m +CONFIG_USB_STORAGE_USBAT=m +CONFIG_USB_STORAGE_SDDR09=m +CONFIG_USB_STORAGE_SDDR55=m +CONFIG_USB_STORAGE_JUMPSHOT=m +CONFIG_USB_STORAGE_ALAUDA=m +CONFIG_USB_STORAGE_ONETOUCH=m +CONFIG_USB_STORAGE_KARMA=m +CONFIG_USB_STORAGE_CYPRESS_ATACB=m +CONFIG_USB_STORAGE_ENE_UB6250=m +CONFIG_MMC=y +CONFIG_MMC_SDHCI=y +CONFIG_MMC_SDHCI_PLTFM=y +CONFIG_MMC_BCM2835=y +CONFIG_MMC_BCM2835_DMA=y +CONFIG_NEW_LEDS=y +CONFIG_LEDS_CLASS=y +CONFIG_LEDS_GPIO=m +CONFIG_LEDS_TRIGGERS=y +CONFIG_LEDS_TRIGGER_TIMER=m +CONFIG_LEDS_TRIGGER_ONESHOT=m +CONFIG_LEDS_TRIGGER_HEARTBEAT=m +CONFIG_LEDS_TRIGGER_BACKLIGHT=m +CONFIG_LEDS_TRIGGER_CPU=y +CONFIG_LEDS_TRIGGER_GPIO=m +CONFIG_LEDS_TRIGGER_DEFAULT_ON=m +CONFIG_LEDS_TRIGGER_TRANSIENT=m +CONFIG_LEDS_TRIGGER_CAMERA=m +# CONFIG_IOMMU_SUPPORT is not set +CONFIG_EXT2_FS=m +CONFIG_EXT3_FS=m +# CONFIG_EXT3_FS_XATTR is not set +CONFIG_EXT4_FS=y +CONFIG_FANOTIFY=y +CONFIG_MSDOS_FS=m +CONFIG_VFAT_FS=m +CONFIG_FAT_DEFAULT_CODEPAGE=850 +CONFIG_FAT_DEFAULT_IOCHARSET="utf8" +CONFIG_TMPFS=y +CONFIG_TMPFS_POSIX_ACL=y +CONFIG_CONFIGFS_FS=m +# CONFIG_MISC_FILESYSTEMS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set +CONFIG_NLS_DEFAULT="utf8" +CONFIG_NLS_CODEPAGE_437=m +CONFIG_NLS_CODEPAGE_850=m +CONFIG_NLS_ASCII=m +CONFIG_NLS_ISO8859_1=m +CONFIG_NLS_ISO8859_15=m +CONFIG_NLS_UTF8=m +CONFIG_PRINTK_TIME=y +CONFIG_STRIP_ASM_SYMS=y +CONFIG_PANIC_ON_OOPS=y +# CONFIG_RCU_CPU_STALL_VERBOSE is not set +CONFIG_STRICT_DEVMEM=y +CONFIG_DEBUG_USER=y +CONFIG_CRYPTO_MANAGER=m +# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set +CONFIG_CRYPTO_NULL=m +# CONFIG_CRYPTO_ANSI_CPRNG is not set +# CONFIG_CRYPTO_HW is not set
configs/raspberrypi_dt_defconfig new file +12 -0
@@ -0,0 +1,12 @@ +BR2_arm=y +BR2_arm1176jzf_s=y +BR2_TARGET_GENERIC_GETTY_PORT="tty1" +BR2_LINUX_KERNEL=y +BR2_LINUX_KERNEL_CUSTOM_GIT=y +BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://github.com/raspberrypi/linux.git" +BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="b9c9f8fc69aaba236169798c18dc1590fccf7acd" +BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/raspberrypi/linux-3.18-rpi-dt.defconfig" +BR2_LINUX_KERNEL_ZIMAGE=y +BR2_PACKAGE_RPI_FIRMWARE=y +BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTBS=y
Signature · 1 line
1.9.1
PATCH v3 2/2 boards/raspberrypi: update readme with Device Tree instructions
In reply to Yann E. MORINSigned-off-by "Yann E. MORIN" <[email protected]>
--- board/raspberrypi/readme.txt | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-)
board/raspberrypi/readme.txt +27 -4
@@ -23,6 +23,10 @@ work on this defconfig: $ make raspberrypi_defconfig +Alternatively, if you want to test support for the Device Tree: + + $ make raspberrypi_dt_defconfig + If you want to use a persistent rootfs, skip to "Build the rootfs", below. For a volatile rootfs, you have to slightly adjust the configuration:
@@ -51,16 +55,22 @@ Result of the build After building, you should obtain this tree: output/images/ - +-- rootfs.tar - +-- rpi-firmware + +-- rootfs.tar [0] + +-- rpi-firmware/ + | +-- bcm2708-rpi-b.dtb [1] + | +-- bcm2708-rpi-b-plus.dtb [1] | +-- bootcode.bin | +-- config.txt | +-- fixup.dat | `-- start.elf `-- zImage -Note for Volatile: rootfs.tar will only be there if you kept -"tar the root filesystem" option selected in "Filesystem images". +[0] Note for Volatile: rootfs.tar will only be there if you kept + "tar the root filesystem" option selected in "Filesystem images". + +[1] The DTBs (Device Tree Blobs) will only be present if you setup + Buildroot to install the DTBs from the rpi-firmware package, and + will only be used if your kernel has support for the Device Tree. Prepare you SDCard ==================
@@ -89,17 +99,30 @@ Install the binaries to the SDCard At the root of the boot partition, the RaspberryPi must find the following files: + * bcm2708-rpi-b.dtb [2] + * bcm2708-rpi-b-plus.dtb [2] * bootcode.bin * config.txt * fixup.dat * start.elf * zImage +[2] Only needed if your kernel has support for the Device Tree. + For example: $ cp output/images/rpi-firmware/* /mnt/mountpointboot + +If your kernel does *not* have support for the Device Tree, then install +it with: + $ cp output/images/zImage /mnt/mountpointboot +If your kernel *does* have support for the Device Tree, then install it +with: + + $ ./output/host/usr/bin/mkknlimg output/images/zImage /mnt/mountpointboot/zImage + Note: The kernel image file name is defined in config.txt like this: kernel=zImage
Signature · 1 line
1.9.1
v3 cover RPi: enable building a device-tree-enabled kernel (branch yem/rpi-dt)
In reply to Yann E. MORINDear Yann E. MORIN,
Quoted 3 lines · Yann E. MORIN
Yann E. MORIN (2):
configs: add a DT-enabled Raspberry Pi defconfig boards/raspberrypi: update readme with Device Tree instructions
Thanks, both applied.
Ultimately, it'd be great to have one single configuration, but we'll see when that becomes possible.
Thanks,
Thomas
Signature · 3 lines
Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com