So, this debug output.
U-Boot SPL 2016.11-rc1-g4dc34be-dirty (Oct 13 2016 - 14:04:10) DRAM: 1024 MiB CPU: 912000000Hz, AXI/AHB/APB: 3/2/2 Trying to boot from MMC2 init mmc 0 resource init mmc 0 clock and io mmc 0 set mod-clk req 24000000 parent 24000000 n 1 m 1 rate 24000000 init mmc 2 resource init mmc 2 clock and io mmc 2 set mod-clk req 24000000 parent 24000000 n 1 m 1 rate 24000000 set ios: bus_width: 1, clock: 0 set ios: bus_width: 1, clock: 400000 mmc 2 set mod-clk req 400000 parent 24000000 n 4 m 15 rate 400000 mmc 2, cmd 0(0x80008000), arg 0x00000000 mmc resp 0x00000000 mmc 2, cmd 8(0x80000148), arg 0x000001aa cmd timeout 100 mmc 2, cmd 55(0x80000177), arg 0x00000000 cmd timeout 100 mmc 2, cmd 0(0x80008000), arg 0x00000000 mmc resp 0x00000000 mmc 2, cmd 1(0x80000041), arg 0x00000000 mmc resp 0x40ff8080 mmc 2, cmd 1(0x80000041), arg 0x40300000 mmc resp 0x40ff8080 mmc 2, cmd 0(0x80008000), arg 0x00000000 mmc resp 0x40ff8080 mmc 2, cmd 1(0x80000041), arg 0x40300000 mmc resp 0x40ff8080 mmc 2, cmd 1(0x80000041), arg 0x40300000 mmc resp 0xc0ff8080 mmc 2, cmd 2(0x800001c2), arg 0x00000000 mmc resp 0x7585c009 0x42030b01 0x34473146 0x1501004d mmc 2, cmd 3(0x80000143), arg 0x00010000 mmc resp 0x00000500 mmc 2, cmd 9(0x800001c9), arg 0x00010000 mmc resp 0x8a404057 0xf6dbffe7 0x0f5903ff 0xd0270132 mmc 2, cmd 13(0x8000014d), arg 0x00010000 mmc resp 0x00000700 mmc 2, cmd 7(0x80000147), arg 0x00010000 mmc resp 0x00000700 mmc 2, cmd 8(0x80002348), arg 0x00000000 trans data 512 bytes cacl timeout 78 msec mmc resp 0x00000900 mmc 2, cmd 8(0x80002348), arg 0x00000000 trans data 512 bytes cacl timeout 78 msec mmc resp 0x00000900 mmc cmd 6 check rsp busy mmc 2, cmd 6(0x80000146), arg 0x03b90100 mmc resp 0x00000900 mmc 2, cmd 13(0x8000014d), arg 0x00010000 mmc resp 0x00000900 mmc 2, cmd 8(0x80002348), arg 0x00000000 trans data 512 bytes cacl timeout 78 msec mmc resp 0x00000900 mmc cmd 6 check rsp busy mmc 2, cmd 6(0x80000146), arg 0x03b70200 cmd timeout 42 mmc cmd 6 check rsp busy mmc 2, cmd 6(0x80000146), arg 0x03b70100 cmd timeout 42 set ios: bus_width: 1, clock: 52000000 mmc 2 set mod-clk req 52000000 parent 600000000 n 1 m 12 rate 50000000 mmc 2, cmd 16(0x80000150), arg 0x00000200 mmc resp 0x00000900 mmc 2, cmd 17(0x80002351), arg 0x00000050 trans data 512 bytes cmd timeout 80 mmc_bread: Failed to read blocks mmc_load_image_raw_sector: mmc block read error SPL: failed to boot from all boot devices ### ERROR ### Please RESET the board ###
Seems u-boot tries bus_width: 1, clock: 52000000, like linux kernel, but fails.
When i bring up the eMMC/SD/SDIO..I did to check the below sequence.
- Power is supplied correctly.
- Clock is enabled correctly
- GPIO pin is set to correct value. (Function, GPIO value..)
- Which buswidth/busmode is supported..and it's correctly changed.
1. power supply is 3.3v on vcc and vccio 2 & 4. datasheet on eemc says
Data bus width : 1bit (Default) , 4bit and 8bit MMC I/F Clock Frequency : 0 ~ 52MHz MMC I/F Boot Frequency : 0 ~ 52MHz
3. GPIO seems are correct, because then i solder sd card via wires on emmc pads, its boots correct