-- AlexWu00 - 12 Oct 2017

Firstly, download openwrt:

Bsides trunk version. right now 15.05 is the latest version.

once download, tar off the package, and cd into openwrt dir.

next, config the system:

make menuconfig

Target System will select Broadcom BCM47xx/53xx (ARM), for the arch of cpu is identical to hps of cyclone v soc, and the rootfs built for this cpu can be used directly on hps.

attached .config has beed debugged, can be downloaded and put into openwrt/ dir for using directly.

if you need config linux kernel, do it like this:

make kernel_menuconfig

However, the kernel built in this system will not be implemented directly. It will be replace by a customized kernel, which can be got from altera github:

https://github.com/altera-opensource/linux-socfpga/branches/all

after openwrt system has been built, we can find kernel in this path:

• [root@localhost openwrt]# ls build_dir/target-arm_cortex-a9_uClibc-0.9.33.2_eabi/linux-bcm53xx/linux-3.18.45/

To match the selected openwrt version, corresponding kernel version will be chosen from altera github.

After we complete system configure, start compiling it. This will take some time, maybe several hours, as a lot of components will be downloaded first. Keep network active during first compile.

When finishing the system compile, serveral images will be created, such as bootloader, rootfs, kernel, they can be found in such path:

• [root@localhost openwrt]# ls build_dir/target-arm_cortex-a9_uClibc-0.9.33.2_eabi/linux-bcm53xx/

Though we get so much, just the rootfs will be used at last. For other components are built for bcm53xx, not for cyclone v soc.

Besides the rootfs, some tool chains will be built meanwhile, such as cross compiler, and some other tools.

Cross compiler can be found in this path:

• [root@localhost openwrt]# ls staging_dir/toolchain-arm_cortex-a9_gcc-4.8-linaro_uClibc-0.9.33.2_eabi/

It includes the arm-openwrt-linux-gcc tool chain, the head files of C lib directory and some other libs. if some other program need be compiled, such as driver, app program, the tool chain can be used directly.

Here, openwrt system building has been completed, we will build a kernel for hps to match the openwrt rootfs. Select the corresponding kernel version and download from altera github,

Please note that, use the cross compiler from the tool chain, which built by openwrt.

arm-openwrt-linux-gcc

For preloader and uboot, they can be built with EDS tool chains. Once got preloader and uboot, they can be merged to one file like this:

cat preloader-mkpimage.bin u-boot.img > uboot-with-spl.sfp

Tool chains mentioned above, including ptgen in staging_dir/host/bin, ok, we should make ptgen can work directly in shell, add this path to enviorenment var PATH:

• export PATH=$PATH:$(pwd)/staging_dir/host/bin

Try ptgen to verify it workable in shell.

If it works, here we can use gen_socfpga_sdcard_img.sh script to gennerate a sd card image like this

./gen_socfpga_sdcard_img.sh openwrt-sdcard.img build_dir/target-arm_cortex-a9_uClibc-0.9.33.2_eabi/linux-bcm53xx/root.ext4 64 uboot-with-spl.sfp uboot-with-spl.sfp

shell script gen_socfpga_sdcard_img.sh can be found in closed.

program the image to sd card:

dd if=openwrt-sdcard.img of=/dev/mmcblk0; sync

unzip boot-for-rootfs.zip and copy the whole directory to the root directory of the rootfs.

Insert sd card to arrow soc kit, select boot_sel to boot from sd card and then power on the board. u-boot will delay 5 seconds to boot linux kernel, we can hit any key to stop booting during the boot delay to get into uboot. And we will set some enviorenment in uboot to make it work correctly. enviorenment should be set like this:

printenv
axibridge=ffd0501c
axibridge_handoff=0x00000000
baudrate=115200
bootargs=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait
bootcmd=run callscript; run mmcload; run mmcboot
bootdelay=5
bootfile=openwrt-socfpga-socfpga_cyclone5_sockit-fit-uImage.itb
bootimage=zImage
bootimagesize=0x600000
bridge_disable=mw $fpgaintf 0; mw $fpga2sdram 0; go $fpga2sdram_apply; mw $axibridge 0; mw $l3remap 0x1
bridge_enable_handoff=mw $fpgaintf ${fpgaintf_handoff}; go $fpga2sdram_apply; mw $fpga2sdram ${fpga2sdram_handoff}; mw $axibridge ${axibridge_handoff}; mw $l3remap ${l3remap_handoff}
callscript=if ext4load mmc 0:2 $fpgadata /boot/$scriptfile;then source $fpgadata; else echo Optional boot script not found. Continuing to boot normally; fi;
ethact=mii0
fdtaddr=0x00000100
fdtimage=socfpga_cyclone5_sockit.dtb
fdtimagesize=0x7000
filesize=0x3a4998
fpga=0
fpga2sdram=ffc25080
fpga2sdram_apply=3ff75544
fpga2sdram_handoff=0x00000311
fpgadata=0x2000000
fpgadatasize=0x700000
fpgaintf=ffd08028
fpgaintf_handoff=0x00000000
l3remap=ff800000
l3remap_handoff=0x00000019
loadaddr=0x01000000
micrel-ksz9021-clk-skew=0xf0f0
micrel-ksz9021-data-skew=0x0
mmcboot=setenv bootargs console=ttyS0,115200 root=${mmcroot} rw rootwait;bootz ${loadaddr} - ${fdtaddr}
mmcload=mmc rescan;${mmcloadcmd} mmc 0:${mmcloadpart} ${loadaddr} /boot/zImage;${mmcloadcmd} mmc 0:${mmcloadpart} ${fdtaddr} /boot/${fdtimage}
mmcloadcmd=ext4load
mmcloadpart=2
mmcroot=/dev/mmcblk0p2
nandboot=setenv bootargs console=ttyS0,115200 root=${nandroot} rw rootfstype=${nandrootfstype};bootz ${loadaddr} - ${fdtaddr}
nandbootimageaddr=0x120000
nandfdtaddr=0xA0000
nandload=nand read ${loadaddr} ${nandbootimageaddr} ${bootimagesize};nand read ${fdtaddr} ${nandfdtaddr} ${fdtimagesize}
nandroot=/dev/mtdblock1
nandrootfstype=jffs2
netboot=dhcp ${bootimage} ; tftp ${fdtaddr} ${fdtimage} ; run ramboot
qspiboot=setenv bootargs console=ttyS0,115200 root=${qspiroot} rw rootfstype=${qspirootfstype};bootz ${loadaddr} - ${fdtaddr}
qspibootimageaddr=0xa0000
qspifdtaddr=0x50000
qspiload=sf probe ${qspiloadcs};sf read ${loadaddr} ${qspibootimageaddr} ${bootimagesize};sf read ${fdtaddr} ${qspifdtaddr} ${fdtimagesize};
qspiloadcs=0
qspiroot=/dev/mtdblock1
qspirootfstype=jffs2
ramboot=setenv bootargs console=ttyS0,115200;bootz ${loadaddr} - ${fdtaddr}
scriptfile=u-boot.scr
setenv_ethaddr_eeprom=3ff99ccd
stderr=serial
stdin=serial
stdout=serial
verify=n

Blue ones should be set identical. After set enviorenment varible correctly, please note save them, and then we can run bootcmd to boot the system.