e4f787ec99
This is largely the same as altera_sockit_defconfig. It uses a fresher Linux and u-boot than SocKit. It also speeds the serial port up to 115200. The post-image script is generalized by adding BR2_ROOTFS_POST_SCRIPT_ARGS and moving it up the altera directory. Similarly, the readme is moved up and made more generic. Signed-off-by: Charles Manning <cdhmanning@gmail.com> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
163 lines
4.5 KiB
Plaintext
163 lines
4.5 KiB
Plaintext
SoCkit
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Intro
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=====
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This is the buildroot board support for the Arrow SoCkit Evaluation Board
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and the Altera Cyclone 5 Development Board.
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A good source of information is :
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http://www.rocketboards.org/foswiki/Documentation/ArrowSoCKitEvaluationBoard
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How it works
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============
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Boot process :
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--------------
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In summary, the bootloader has multiple stages, an hardcoded boot routine is
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loaded from an on-chip ROM.
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- That first stage is scanning the SD card's partition table to find
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partition having the 0xA2 type.
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- This partition is expected to contain a boot image on its first 60 Kb,
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because u-boot is bigger, we must fill it with a preloader (u-boot-spl)
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which will load the u-boot image.
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- Then the u-boot image will load the Linux kernel.
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A good source of information for the boot process is :
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http://xillybus.com/tutorials/u-boot-image-altera-soc
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Note for the SPL :
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The SPL generated by the u-boot from Rocketboards doesn't seems to work,
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therefore we provide a patch for {uboot-PKG}/board/altera/socfpga_cyclone5/*
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based on the files generated with the Altera example design.
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For more information about this files please look at :
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http://www.rocketboards.org/foswiki/Documentation/PreloaderUbootCustomization#Common_Source_Code
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How to build it
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===============
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Configure Buildroot
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-------------------
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The altera_sockit_defconfig configuration is a minimal configuration with
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all that is required to bring the SoCkit :
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$ make altera_sockit_defconfig
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and for the SoC Development Board :
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$ make altera_sockdk_defconfig
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Build everything
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----------------
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Note: you will need to have access to the network, since Buildroot will
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download the packages' sources.
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$ make
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Result of the build
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-------------------
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After building, you should obtain this tree:
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output/images/
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├── rootfs.ext2
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├── rootfs.ext3 -> rootfs.ext2
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├── rootfs.tar
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├── socfpga_cyclone5_sockit.dtb or socfpga_cyclone5_socdk.dtb
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├── socfpga.dtb
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├── u-boot.img
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├── u-boot-spl.bin
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└── uImage
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Signing the Preloader
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---------------------
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*** BEWARE ****
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The u-boot-spl.bin must be signed using the Altera's tool "mkpimage".
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This tool comes as a part of the Altera development environnment (SoC EDS).
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A fork of this tool have been done by Maxime Hadjinlian and can be found here :
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https://github.com/maximeh/mkpimage
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Remember that without signing the u-boot-spl.bin, the board will not boot !!!
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$ mkpimage u-boot-spl.bin -o u-boot-spl-signed.bin
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Prepare your SDcard
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===================
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A good source of information for the partitioning process is :
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http://www.rocketboards.org/foswiki/view/Projects/SoCKitLinaroLinuxDesktop#Partition_the_SD_Card
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Create the SDcard partition table
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----------------------------------
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Determine the device associated to the SD card :
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$ cat /proc/partitions
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let's assume it is /dev/mmcblk0 :
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$ sudo fdisk /dev/mmcblk0
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Delete all previous partitions with 'd' then create the new partition table,
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using these options, pressing enter after each one:
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* n p 1 9000000 +20480K t 1 b
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* n p 2 4096 +4496384K t 83
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* n p 3 2048 +1024K t 3 a2
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Using the 'p' option, the SD card's partition must look like this :
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Device Boot Start End Blocks Id System
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/dev/mmcblk0p1 9000000 9041919 20960 b W95 FAT32
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/dev/mmcblk0p2 4096 8996863 4496384 83 Linux
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/dev/mmcblk0p3 2048 4095 1024 a2 Unknown
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Then write the partition table using 'w' and exit.
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Make partition one a DOS partition :
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$ sudo mkdosfs /dev/mmcblk0p1
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Install the binaries to the SDcard
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----------------------------------
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Remember your binaries are located in output/images/, go inside that directory :
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$ cd output/images
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The partition with type a2 is the partition scan by the first bootloader stage
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in the SoCkit ROM to find the next bootloader stage so we must write the signed
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preloader and the u-boot binaries in that partition :
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$ sudo dd if=u-boot-spl-signed.bin of=/dev/mmcblk0p3 bs=64k seek=0
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$ sudo dd if=u-boot.img of=/dev/mmcblk0p3 bs=64k seek=4
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Copy the Linux kernel and its Device tree :
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$ sudo mkdir /mnt/sdcard
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$ sudo mount /dev/mmcblk0p1 /mnt/sdcard
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$ sudo cp socfpga.dtb uImage /mnt/sdcard
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$ sudo umount /mnt/sdcard
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Copy the rootfs :
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$ sudo dd if=rootfs.ext2 of=/dev/mmcblk0p2 bs=64k
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$ sudo sync
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It's Done!
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Finish
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======
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Eject your SDcard, insert it in your SoCkit, and power it up.
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if you want a serial console, you can plug a micro B USB cable on the USB-UART
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port, the serial port config to used is 57600/8-N-1.
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