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.

---

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.