Booting Linux from QSPI on SoCKit board

Finally I solve the problem. Many thanks to Terasic support team and Amy Zhou in particular. It turned out that socfpga_cyclone5_sockit.dts file in linux-socfpga folder didn't contain correct definition of QSPI-flash (my SocKit board is equipped with N25Q512A). So I got from Terasic support a correct version of .dts (here I adduce not a whole file, but only QSPI definition):

&qspi {

status = "okay";

flash0: n25q512a@0 {

# address-cells = <1>;

# size-cells = <1>;

compatible = "n25q512a";

reg = <0>; /* chip select */

spi-max-frequency = <100000000>;

m25p,fast-read;

page-size = <256>;

block-size = <16>; /* 2^16, 64KB */

read-delay = <4>; /* delay value in read data capture register */

tshsl-ns = <50>;

tsd2d-ns = <50>;

tchsh-ns = <4>;

tslch-ns = <4>;

cdns,page-size = <256>;

cdns,block-size = <16>;

cdns,tshsl-ns = <50>;

cdns,tsd2d-ns = <50>;

cdns,tchsh-ns = <4>;

cdns,tslch-ns = <4>;

partition@qspi-boot {

/* 8MB for raw data. */

label = "Flash 0 Raw Data";

reg = <0x0 0x800000>;

};

partition@qspi-rootfs {

/* 56MB for jffs2 data. */

label = "Flash 0 jffs2 Filesystem";

reg = <0x00800000 0x03800000>;

};

};

};

I couldn't generate .dts file using sopc2dts command from SoC EDS shell as shown in 'GSRD v13.1 - Booting from QSPI' document on rocketboards.org because of error ("Dont parse...").

To build a preloader-with-qspi-header.img and u-boot.img I used SoC EDS 16.1 under Win 8. As a reference Quartus project a GHRD-project from SoCKit_v.3.0.0_SystemCD Demonstrations\Linux_BSP\Console\GHRD has been used.

Under Ubuntu16 I cloned linux-socfpga : git clone https://github.com/altera-opensource/linux-socfpga.git

I used linux 4.1 : git checkout socfpga-4.1.

Also I installed SoC EDS 16.1 to use it cross-compiler to build a Kernel and a .dtb-file.

To build a root filesystem a buildroot was used : git clone git://git.buildroot.net/buildroot. I set Filesystem images-> jffs2 root filesystem - Flash Type - Parallel flash with 64 kb erase size.

Finally I flashed preloader-with-qspi-header.img, u-boot.img, socfpga.dtb, zImage and rootfs.jffs2 into QSPI-flash according to 'BootTheArrowSoCKitFromQSPI' document using linux mtd_debug utility. After these steps I can boot Linux from QSPI-flash.