Hello,
I am currently working on a small project for the DE10 Nano Board and setup Pinmux for the Ethernet PHY signals. As I need the preloader to configure the Pinmux in the HPS, I have tried to set this up based on the current u-boot-socfpga branch. For this purpose i followed different guides on rocketboards.org and the "AN 709: HPS SoC Boot Guide" on how to build a bootloader and configure HPS from FPGA using EPCS64 flash memory. I could configure SPL_TEXT_BASE=0xC0000000 and "Support booting from SPI Flash" in menuconfig, build and create .hex file from u-boot-spl to initalize the on-chip RAM. Problem is that the preloader does not seem to be executed. Upon further investigation i noticed that the spl data address is not at 0XFFFF0000 as suggested by several older guides: arm-none-eabi-readelf -S spl/u-boot-spl There are 19 section headers, starting at offset 0x1482f4: Section Headers: [Nr] Name Type Addr Off Size ES Flg Lk Inf Al [ 0] NULL 00000000 000000 000000 00 0 0 0 [ 1] .text PROGBITS c0000000 001000 00b5d4 00 AX 0 0 64 [ 2] .rodata PROGBITS c000b5d4 00c5d4 00232b 00 A 0 0 4 [ 3] .data PROGBITS c000d900 00e900 000098 00 WA 0 0 4 [ 4] __u_boot_list PROGBITS c000d998 00e998 000840 00 WA 0 0 4 [ 5] .bss PROGBITS c000e1d8 00f1d8 000010 00 W 0 0 4 [ 6] .ARM.attributes ARM_ATTRIBUTES 00000000 00f1e8 000029 00 0 0 1 [ 7] .comment PROGBITS 00000000 00f211 000026 01 MS 0 0 1 [ 8] .debug_line PROGBITS 00000000 00f237 0292fa 00 0 0 1 [ 9] .debug_info PROGBITS 00000000 038531 08eab7 00 0 0 1 [10] .debug_abbrev PROGBITS 00000000 0c6fe8 0134ca 00 0 0 1 [11] .debug_aranges PROGBITS 00000000 0da4b8 002948 00 0 0 8 [12] .debug_str PROGBITS 00000000 0dce00 010da7 01 MS 0 0 1 [13] .debug_loc PROGBITS 00000000 0edba7 042307 00 0 0 1 [14] .debug_ranges PROGBITS 00000000 12feb0 006ca0 00 0 0 8 [15] .debug_frame PROGBITS 00000000 136b50 007324 00 0 0 4 [16] .symtab SYMTAB 00000000 13de74 006a70 10 17 1244 4 [17] .strtab STRTAB 00000000 1448e4 00394d 00 0 0 1 [18] .shstrtab STRTAB 00000000 148231 0000c1 00 0 0 1 I also couldn't find that value in the menuconfig, nor could I find any up-to-date guidelines for booting HPS preloader from FPGA. Can you tell me if this approach is still viable and how to implement it correctly? Best regards, Hannes Grabmann
