U-Boot 2017.09 (Mar 15 2021 - 17:56:33 +0800)
Model: Rockchip PX30 EVB
PreSerial: 2
DRAM: 992 MiB
Sysmem: init
Relocation Offset is: 3dbe5000
Using default environment
dwmmc@ff370000: 1, dwmmc@ff390000: 0
Bootdev(atags): mmc 0
MMC0: HS200, 150Mhz
PartType: EFI
boot mode: None
Load FDT from boot part
DTB: rk-kernel.dtb
I2c speed: 100000Hz
PMIC: RK8090 (on=0x40, off=0x00)
vdd_logic 1100000 uV
vdd_arm 1100000 uV
Failed to found available display route
Failed to found available display route
Model: AIO-PX30JD4 Board (Linux Opensource)
CLK: (sync kernel. arm: enter 600000 KHz, init 600000 KHz, kernel 600000 KHz)
apll 600000 KHz
dpll 664000 KHz
cpll 24000 KHz
npll 1188000 KHz
gpll 1200000 KHz
aclk_bus 200000 KHz
hclk_bus 150000 KHz
pclk_bus 100000 KHz
aclk_peri 200000 KHz
hclk_peri 150000 KHz
pclk_pmu 100000 KHz
Net: eth0: ethernet@ff360000
Hit key to stop autoboot('CTRL+C'): 0
ANDROID: reboot reason: "(none)"
Fdt Ramdisk skip relocation
Booting IMAGE kernel at 0x00280000 with fdt at 0x8300000...
以上是启动信息，无法CTRL+C终止autoboot，我们自己做的硬件debug口是GPIO1_D2、GPIO1_D3刚好对应uart2m0_xfer
