Nothing but red light.

[fire219]

Finally managed to get a serial connection working (pins 6/7/8 on EXP port are GND, RX, and TX respectively).

Code:

BOOT0 is starting! boot0 commit : 045061a8bb2580cb3fa02e301f52a015040c158f boot0 version : 4.0.0 set pll start

It gets there and stops indefinitely. Checking other people's boot logs, the next line should be "set pll end". So either something is wrong when it tries to set the PLL clock speed, or it's a power issue that is cutting it off early...

Help would still be greatly appreciated.

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Got further, by random:

Code:

HELLO! BOOT0 is starting! boot0 commit : 045061a8bb2580cb3fa02e301f52a015040c158f boot0 version : 4.0.0 set pll start set pll end rtc[0] value = 0x00000000 rtc[1] value = 0x00000000 rtc[2] value = 0x00000000 rtc[3] value = 0x00000000 rtc[4] value = 0x00000000 rtc[5] value = 0x00000000 DRAM driver version: V1.1 rsb_send_initseq: rsb clk 400Khz -> 3Mhz PMU: AXP81X ddr voltage = 1500 mv DRAM Type = 3 (2:DDR2,3:DDR3,6:LPDDR2,7:LPDDR3) DRAM clk = 672 MHz DRAM zq value: 003b3bbb ZQ calibration error,check external 240 ohm resistor. DRAM init error! initializing SDRAM Fail.

Doesn't look good though.