本帖最后由 Monster_Mr 于 2018-2-6 17:42 编辑
自己做的板子，工厂生产测试的时候发现一批板子中的一部分板子启动的时候偶尔会出现停在Starting kernel ...里不动，但有时候又能正常启动，板子都是使用的同一个固件，测量硬件电压的时候发现，正常启动时VDD_GPU电压会从1.1V降到0.86V，在uboot阶段是1.1V,在kernel阶段为0.86V,当板子不能正常启动停在Starting kernel 时，电压一直维持在1.1V，VDD_GPU电路图如下：
尝试过修改/kernel/arch/arm/boot/dts里的DDR频率，发现没有改善
&clk_ddr_dvfs_table {
operating-points = <
/* KHz uV */
200000 1075000
300000 1075000
456000 1125000
533000 1150000
>;
freq-table = <
/*status freq(KHz)*/
SYS_STATUS_NORMAL 400000
SYS_STATUS_SUSPEND 200000
SYS_STATUS_VIDEO_1080P 240000
SYS_STATUS_VIDEO_4K 400000
SYS_STATUS_PERFORMANCE 528000
SYS_STATUS_DUALVIEW 400000
SYS_STATUS_BOOST 324000
SYS_STATUS_ISP 533000
>;
auto-freq-table = <
240000
324000
396000
528000
>;
auto-freq=<0>;
status="okay";
};
利用串口抓取串口信息如下，现在没有一点思路，希望各位大神指点一二
DDR Version 1.00 20150318
In
Channel a: DDR3 200MHz
Bus Width=32 Col=10 Bank=8 Row=15 CS=1 Die Bus-Width=16 Size=1024MB
Channel b: DDR3 200MHz
Bus Width=32 Col=10 Bank=8 Row=15 CS=1 Die Bus-Width=16 Size=1024MB
Memory OK
Memory OK
OUT
U-Boot 2014.10-RK3288-10 (Feb 05 2018 - 17:03:06)
CPU: rk3288
CPU's clock information:
arm pll = 600000000HZ
periph pll = 297000000HZ
ddr pll = 200000000HZ
codec pll = 384000000HZ
Board: Rockchip platform Board
DRAM: Found dram banks:1
Adding bank:0000000000000000(0000000080000000)
128 MiB
storage init OK!
Using default environment
GetParam
check parameter success
failed to prepare fdt from boot!
power key: bank-0 pin-5
can't find dts node for ricoh619
can't find dts node for act8846
pmic:rk808
Can't find dts node for fuel guage cw201x
SecureBootEn = 0, SecureBootLock = 0
#Boot ver: 2018-02-05#2.19
empty serial no.
checkKey
vbus = 1
no fuel gauge found
no fuel gauge found
read logo on state from dts [1]
can't find power_ctr node for lcdc0
pll_src = 0, dclk_hz = 65000000, dclk_div = 6
load mipi dsi chip:rk_mipi_dsi.0 id:3133302a
mipi_dsi v1.3 2014-04-17
failed to find part:logo
no fuel gauge found
rk_pwm_config:brightness:180
Hit any key to stop autoboot: 0
load fdt from resouce.
Secure Boot state: 0
kernel @ 0x02000000 (0x00686e58)
ramdisk @ 0x05bf0000 (0x00147ab4)
bootrk: do_bootm_linux...
Loading Device Tree to 05600000, end 0561a8f2 ... OK
Add bank:0000000000000000, 0000000080000000
Starting kernel ...
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