Changes between Version 38 and Version 39 of buildroot

Timestamp:

12/12/2020 03:54:48 AM (3 years ago)

Author:

Tim Harvey

Comment:

updated newport examples for 5.4.45 minimal kernel config

buildroot

@@ -288 +288 @@
 [=#newport]
 == Newport (CN80XX)
-The following details pertain to buildroot 2017.11 although newer versions will likely be similar if not the same.
-
-To configure buildroot for the Cavium CN80XX/CN81XX SoC found on the Newport product family:
- - interactive menu options:
-  * Target options -> Target Architecture -> AArch64 (little endian) (BR2_aarch64)
-  * Filesystem images -> tar the root filesystem -> Compression method (xz) (BR2_TARGET_ROOTFS_CPIO_XZ)
-  * Filesystem images -> cpio the root filesystem (BR2_TARGET_ROOTFS_CPIO)
-  * Filesystem images -> Compression method (xz) (BR2_TARGET_ROOTFS_TAR_XZ)
- - defconfig:
-{{{#!bash
-cat << EOF > configs/my_defconfig
+The following details pertain to buildroot 2020.08 although newer versions will likely be similar if not the same.
+
+The Newport product family is based on the CN80xx SoC which has 4x Cortex-A53 like compatible CPU cores. Therefore the 'BR2_aarch64' is really the only important configuration which produces binaries executable on arm64 CPU's.
+
+To build a root filesystem only:
+{{{#!bash
+cat << EOF > configs/arm64_minimal_defconfig
+# arm64 arch
 BR2_aarch64=y
-BR2_TARGET_ROOTFS_CPIO=y
-BR2_TARGET_ROOTFS_CPIO_XZ=y
+# filesystem options
 BR2_TARGET_ROOTFS_TAR_XZ=y
 EOF
-make my_defconfig
-}}}
-
-This builds a ~500KiB output/images/root.tar.xz in less than 5 minutes on a typical Linux desktop.
-
-If you also want buildroot to build a kernel provided from buildroot using the buildroot rootfs embedded as an initramfs then enable the following to create a kernel suitable for aarch64 and booting via U-Boot {{{booti}}}:
- * Kernel -> Linux Kernel (BR2_LINUX_KERNEL)
- * Kernel -> Kernel configuration (Using a custom (def)config file) -> newport_defconfig
- * Filesystem images -> initial RAM filesystem linked into linux kernel
-
-Adding the kernel build produces a ~21MB Image in less than 10 minutes on a typical Linux desktop.
-
-To boot this on a Newport bootloader:
-{{{#!bash
-tftpboot ${kernel_addr_r} newport/buildroot/Image && booti ${kernel_addr_r} - ${fdtcontroladdr}
-}}}
-
-Now you have a minimal Linux OS that booted in about 6 seconds.
-
-A prebuilt image can be found [http://dev.gateworks.com/buildroot/newport/minimal here] which contains:
- * Linux 4.14 kernel with ThunderX periperhals enabled
+make arm64_minimal_defconfig
+make -j8
+}}}
+
+This builds output/images/root.tar.xz consisting of a ~1.7MiB root filesystem (when uncompressed) in 5 to 10 minutes of building on a typical Linux desktop.
+
+If you also want buildroot to build a Gateworks v5.4.45 kernel with a minimal kernel config attached as an initrd you can use this:
+{{{#!bash
+cat << EOF > configs/newport_kernel_defconfig
+# arm64 arch
+BR2_aarch64=y
+# toolchain
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_4=y
+# kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_GIT=y
+BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/Gateworks/linux-newport.git"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="v5.4.45-newport"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="newport_minimal_kernel_defconfig"
+# filesystem options
+BR2_TARGET_ROOTFS_TAR_XZ=y
+BR2_TARGET_ROOTFS_INITRAMFS=y
+EOF
+# fetch minimal kernel config
+wget http://dev.gateworks.com/buidlroot/newport/minimal/newport_minimal_kernel_defconfig
+make newport_kernel_defconfig
+make -j8
+}}}
+
+This produces a ~9MiB output/images/Image in 10 to 15 minutes of building on a typical Linux desktop. This is a kernel Image containing the root filesystem in a ramdisk. This is a really easy way to get a read-only minimal Linux image that boots fast and does not access flash storage.
+
+You can boot a Kernel+ramdisk via U-Boot like this:
+ * load from network tftpserver
+{{{#!bash
+tftpboot $kernel_addr_r Image && booti $kernel_addr_r - $fdtcontroladdr
+}}}
+ * load from microSD with ext/fat filesystem
+{{{#!bash
+load mmc 1:1 $kernel_addr_r Image && booti $kernel_addr_r - $fdtcontroladdr
+}}}
+ * load from USB with ext/fat filesystem
+{{{#!bash
+usb start; load usb 0:1 $kernel_addr_r Image && booti $kernel_addr_r - $fdtcontroladdr
+}}}
+
+A prebuilt image can be found ​here which contains:
+ * Gateworks Linux 5.4.45 kernel
  * resize2fs (BR2_PACKAGE_E2FSPROGS_RESIZE2FS)
+ * uclibc
  * screen (BR2_PACKAGE_SCREEN)
  * pciutils (BR2_PACKAGE_PCIUTILS)
  * libusb (BR2_PACKAGE_LIBUSB)
- * eudev (BR2_PACKAGE_HAS_UDEV)
- * usbutils (BR2_PACKAGE_USBUTILS) 
- * disk partitioning tools
+ * eudev (BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV) (required for usbutils)
+ * usbutils (BR2_PACKAGE_USBUTILS)
+ * gdisk/sgdisk disk partitioning tools:
+ * gdisk/sgdisk (BR2_PACKAGE_GPTFDISK/BR2_PACKAGE_GPTFDISK_SGDISK)
+ * stress (BR2_PACKAGE_STRESS)
+ * evtest (BR2_PACKAGE_EVTEST)