Changes between Version 36 and Version 37 of buildroot

Timestamp:

12/12/2020 01:08:19 AM (4 years ago)

Author:

Tim Harvey

Comment:

updated ventana instructions for 5.4.45 kernel

buildroot

@@ -37 +37 @@
 
 For platform specific notes see below:
+ * [#venice Gateworks Venice (imx8mm)]
+ * [#newport Gateworks Newport (cn80xx)]
  * [#ventana Gateworks Ventana (imx6)]
- * [#newport Gateworks Newport (cn80xx)]
 
 References:
@@ -422 +423 @@
 [=#ventana]
 == Ventana (IMX6)
-The following details pertain to buildroot 2017.08 although newer versions will likely be similar if not the same.
-
-To configure buildroot for the i.MX6 SoC found on the Ventana product family:
- * Target options -> Target Architecture -> ARM (little endian)
- * Target options -> Target Architecture Variant -> cortex-A9 (BR2_GCC_TARGET_CPU)
- * Target options -> Enable NEON SIMD extension support (BR2_ARM_ENABLE_NEON=y)
- * Target options -> Enable VFP extension support (BR2_ARM_ENABLE_VFP=y)
- * Target options -> Floating point strategy (NEON) (BR2_ARM_FPU_NEON=y)
- * Filesystem images -> tar the root filesystem -> Compression method (xz)
-
-This builds a ~500KiB output/images/rootfs.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 imx_v6_v7 and booting via U-Boot {{{bootm}}}:
- * Kernel -> Linux Kernel (BR2_LINUX_KERNEL)
- * Kernel -> Defconfig name (imx_v6_v7) (BR2_LINUX_KERNEL_DEFCONFIG)
- * Kernel -> Kernel binary format (uImage)
- * Kernel -> load address (0x10008000) (BR2_LINUX_KERNEL_UIMAGE_LOADADDR)
- * Kernel -> Device Tree Source file names (imx6dl-gw54xx imx6q-gw54xx imx6dl-gw53xx imx6q-gw53xx imx6dl-gw52xx imx6q-gw52xx imx6dl-gw51xx imx6q-gw51xx imx6dl-gw551x imx6q-gw551x imx6dl-gw552x imx6q-gw552x imx6dl-gw553x imx6q-gw553x imx6dl-gw5913) (BR2_LINUX_KERNEL_INTREE_DTS_NAME)
- * Filesystem images -> initial RAM filesystem linked into linux kernel
-
-Adding the kernel build produces a ~6MB uImage in less than 10 minutes on a typical Linux desktop.
-
-To boot this on a Ventana bootloader:
-{{{#!bash
-tftpboot ${loadaddr} ventana/uImage && tftpboot ${fdt_addr} ventana/${fdt_file2} && bootm ${loadaddr} - ${fdt_addr}
-}}}
-
-Now you have a minimal Linux OS that booted in about 6 seconds.
-
-A prebuilt image of this can be found at: http://dev.gateworks.com/buildroot/ventana/minimal
-
-Additional tools:
- * resize2fs
- * screen
+The following details pertain to buildroot 2020.08 although newer versions will likely be similar if not the same.
+
+The Ventana product family is based on the i.MX6 SoC which has ARM Cortex-A9 CPU cores. Therefore we will tune the compiler to build arm32 code with support for ARM NEON and VFP.
+
+To build a root filesystem only:
+{{{#!bash
+cat << EOF > configs/imx6_minimal_defconfig
+# arm cortex-a9 cpu
+BR2_arm=y
+BR2_cortex_a9=y
+BR2_ARM_ENABLE_NEON=y
+BR2_ARM_ENABLE_VFP=y
+BR2_ARM_FPU_VFPV3=y
+# filesystem options
+BR2_TARGET_ROOTFS_CPIO_XZ=y
+EOF
+make imx6_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 and a self-contained minimal root filesystem you would add the following the your defconfig:
+{{{#!bash
+cat << EOF > configs/ventana_kernel_defconfig
+# arm cortex-a9 cpu
+BR2_arm=y
+BR2_cortex_a9=y
+BR2_ARM_ENABLE_NEON=y
+BR2_ARM_ENABLE_VFP=y
+BR2_ARM_FPU_VFPV3=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-imx6.git"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="gateworks_5.4.45"
+BR2_LINUX_KERNEL_DEFCONFIG="gwventana"
+# filesystem options
+BR2_TARGET_ROOTFS_TAR_XZ=y
+EOF
+# fetch minimal kernel config for ventana
+wget http://dev.gateworks.com/buildroot/ventana/minimal/gwventana_minimal_kernel_defconfig
+make ventana_kernel_defconfig
+make -j8
+}}}
+
+This produces a ~7MiB compressed kernel image in output/images/uImage containing the ~1.7MiB root filesystem in 15 to 20 minutes of building on a typical Linux desktop.
+
+If you need add back or modify kernel features you can do so with:
+{{{#!bash
+make linux-menuconfig # make your changes
+make -j8
+# save and update the defconfig once you are happy with it
+make linux-savedefconfig linux-update-defconfig
+}}}
+
+To boot a kernel+ramdisk on Ventana via the bootloader with a tftpserver copy output/images/uImage and output/images/*.dtb to your tftpserver and use:
+ * load from network tftpserver
+{{{#!bash
+setenv bootargs console=ttymxc1,115200
+setenv fsload tftpboot
+setenv bootdir . # set this to the prefix of your tftp dir
+run loadfdt && $fsload $kernel_addr_r $bootdir/uImage && bootm $loadaddr - $fdt_addr
+}}}
+ * load from microSD with ext/fat filesystem
+{{{#!bash
+setenv bootargs console=ttymxc1,115200
+setenv fsload load mmc 0:1
+setenv bootdir . # set this to the prefix of your tftp dir
+run loadfdt && $fsload $kernel_addr_r $bootdir/uImage && bootm $loadaddr - $fdt_addr
+}}}
+ * load from USB with ext/fat filesystem
+{{{#!bash
+setenv bootargs console=ttymxc1,115200
+setenv fsload load usb 0:1
+usb start
+setenv bootdir . # set this to the prefix of your tftp dir
+run loadfdt && $fsload $kernel_addr_r $bootdir/uImage && bootm $loadaddr - $fdt_addr
+}}}
+
+A prebuilt image can be found [http://dev.gateworks.com/buildroot/ventana/minimal here] which contains:
+ * Gateworks Linux 5.4.45 kernel (minimal kernel features)
+ * resize2fs (BR2_PACKAGE_E2FSPROGS_RESIZE2FS)
+ * uclibc
+ * screen (BR2_PACKAGE_SCREEN)
+ * pciutils (BR2_PACKAGE_PCIUTILS)
+ * libusb (BR2_PACKAGE_LIBUSB)
+ * 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)
  * ubi/ubifs tools
- * pciutils usb-utils
- * disk partitioning tools
+