Hello!
I am very new to Xilinx/Linux development and am running into a problem trying to boot PetaLinux from QSPI flash.
I used PetaLinux tools to build uBoot and kernel images and then I create boot.bin file like this:
petalinux-package --boot --force --fsbl zynq_fsbl.elf --fpga pre-build/linux/implementation/download.bit --u-boot --kernel
The line above creates a 14MB BOOT.BIN file with FSBL, FPGA program, uBoot, and linux kernel.
I copied BOOT.BIN and image.ub to SD card and it booted fine.
I then copied BOOT.BIN to QSPI flash of my Zed board:
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U-Boot-PetaLinux-2> sf probe 0 0 0 #connect to QSPI flash device
SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB
U-Boot-PetaLinux-2> mmcinfo && fatload mmc 0 ${netstart} ${boot_img} #connect to mmc and load boot image (BOOT.BIN) from mmc to ram address ${netstart}
Device: zynq_sdhci
Manufacturer ID: 27
OEM: 5048
Name: SD04G
Tran Speed: 50000000
Rd Block Len: 512
SD version 3.0
High Capacity: Yes
Capacity: 3.7 GiB
Bus Width: 4-bit
reading BOOT.BIN
14316288 bytes read in 1224 ms (11.2 MiB/s)
U-Boot-PetaLinux-2> sf erase 0 0xDB0000 #14316288 bytes is 0xDA7300 in hex. Aligned to 64K this gives 0xDB0000
SF: 14352384 bytes @ 0x0 Erased: OK
U-Boot-PetaLinux-2> sf write ${netstart} 0x0 0xDA7300 #write 0xDA7300 (14316288) bytes from ${netstart} to flash starting at 0x0
SF: 14316288 bytes @ 0x0 Written: OK
#Verify that boot image saved correctly
U-Boot-PetaLinux-2> md ${netstart} c #dump 12 words of memory starting at address ${netstart}
01000000: eafffffe eafffffe eafffffe eafffffe ................
01000010: eafffffe eafffffe eafffffe eafffffe ................
01000020: aa995566 584c4e58 00000000 01010000 fU..XNLX........
U-Boot-PetaLinux-2> sf read 0x02000000 0x0 0x100 #read 256 bytes from flash address 0x0 to RAM address 0x02000000
SF: 256 bytes @ 0x0 Read: OK
U-Boot-PetaLinux-2> md 0x02000000 c #dump 12 words from memory address 0x02000000
02000000: eafffffe eafffffe eafffffe eafffffe ................
02000010: eafffffe eafffffe eafffffe eafffffe ................
02000020: aa995566 584c4e58 00000000 01010000 fU..XNLX........
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I then power-down the board, change jumper settings to boot from QSPI flash and power the board back on.
The board boots into uBoot, but not into linux kernel. I examined memory using iminfo command and it looks like there is no valid image at ${netstart} address where kernel is supposed to be loaded.
My best guess is that FSBL does not load kernel into RAM for some reason.
Is there a way to configure FSBL or BOOT.BIN to make FSBL load kernel into RAM?
Is there a better/proper way to boot from QSPI?
I examined ZedBoard boot guide but there is not information there on how to create proper BOOT.BIN.
I am hoping to find a way to use petalinux-config and petalinux-package to create QSPI-bootable image.
Thank you.
