【骚操作】启动阶段改设备DTS的方法
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在设备BSP调试的过程中,经常会出现需要修改DTS的情况,比如调试一个新的屏幕、传感器或者wifi模组,传统的方法是:
在源码中直接修改board.dts文件->重新编译&打包->烧写到设备里
这种方法繁杂,编译和烧写都要花费时间,严重影响开发效率。
因此,全志提供了一个启动阶段DTS调试的方法,可以让我们在启动阶段就把DTS改掉,这次启动加载的就是改后的DTS。
*注:这种修改是一次性的,不可以保存的,只限这次启动的时候生效,断电或者重启就不生效了1.设备上电过程中串口按住电脑键盘的"s"按键,让设备进入boot:
*注:是真的按住调试的电脑的键盘的s按键,和按住2另设备跳烧录的操作一样(参考:https://d1.docs.aw-ol.com/study/study_4compile/#pc2)
如果进入boot成功,就会有如下log,这时就可以在串口对设备进行DTS修改操作。
(详细log如下)[188]HELLO! BOOT0 is starting! [191]BOOT0 commit : 27369ab [194]set pll start [196]periph0 has been enabled [199]set pll end [200][pmu]: bus read error [203]board init ok [205]DRAM only have internal ZQ!! [208]get_pmu_exist() = -1 [210]DRAM BOOT DRIVE INFO: V0.24 [213]DRAM CLK = 792 MHz [215]DRAM Type = 3 (2:DDR2,3:DDR3) [219]DRAMC ZQ value: 0x7b7bfb [221]DRAM ODT value: 0x42. [224]ddr_efuse_type: 0x0 [227]DRAM SIZE =1024 M [231]DRAM simple test OK. [233]dram size =1024 [235]key press : s [237]spinand UBOOT_START_BLK_NUM 8 UBOOT_LAST_BLK_NUM 32 [242]block from 8 to 32 [318]Check is correct. [320]dma 0x2f9f8 int is not used yet [323]dma 0x2f9f8 int is free, you do not need to free it again [329]Entry_name = opensbi [332]Entry_name = u-boot [335]Entry_name = dtb [338]Jump to second Boot. OpenSBI v0.6 ____ _____ ____ _____ / __ \ / ____| _ \_ _| | | | |_ __ ___ _ __ | (___ | |_) || | | | | | '_ \ / _ \ '_ \ \___ \| _ < | | | |__| | |_) | __/ | | |____) | |_) || |_ \____/| .__/ \___|_| |_|_____/|____/_____| | | |_| Platform Name : T-HEAD Xuantie Platform Platform HART Features : RV64ACDFIMSUVX Platform Max HARTs : 1 Current Hart : 0 Firmware Base : 0x40000400 Firmware Size : 75 KB Runtime SBI Version : 0.2 MIDELEG : 0x0000000000000222 MEDELEG : 0x000000000000b1ff PMP0 : 0x0000000040000000-0x000000004001ffff (A) PMP1 : 0x0000000040000000-0x000000007fffffff (A,R,W,X) PMP2 : 0x0000000080000000-0x00000000bfffffff (A,R,W,X) PMP3 : 0x0000000000020000-0x0000000000027fff (A,▒ U-Boot 2018.05-g0a88ac9 (Apr 30 2021 - 11:23:28 +0000) Allwinner Technology [00.421]DRAM: 1 GiB [00.423]Relocation Offset is: 3def0000 [00.427]secure enable bit: 0 [00.429]CPU=1008 MHz,PLL6=600 Mhz,AHB=200 Mhz, APB1=100Mhz MBus=300Mhz [00.436]flash init start [00.438]workmode = 0,storage type = 0 [00.444]sunxi-spinand-phy: not detect any munufacture from id table [00.450]sunxi-spinand-phy: get spi-nand Model from fdt fail [00.456]sunxi-spinand-phy: get phy info from fdt fail device nand0 <nand>, # parts = 4 #: name size offset mask_flags 0: boot0 0x00100000 0x00000000 1 1: uboot 0x00300000 0x00100000 1 2: secure_storage 0x00100000 0x00400000 1 3: sys 0x0fb00000 0x00500000 0 active partition: nand0,0 - (boot0) 0x00100000 @ 0x00000000 defaults: mtdids : nand0=nand mtdparts: mtdparts=nand:1024k@0(boot0)ro,3072k@1048576(uboot)ro,1024k@4194304(secure_storage)ro,-(sys) [00.794]ubi0: attaching mtd4 [01.190]ubi0: scanning is finished [01.200]ubi0: attached mtd4 (name "sys", size 251 MiB) [01.204]ubi0: PEB size: 262144 bytes (256 KiB), LEB size: 258048 bytes [01.211]ubi0: min./max. I/O unit sizes: 4096/4096, sub-page size 2048 [01.217]ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096 [01.223]ubi0: good PEBs: 1004, bad PEBs: 0, corrupted PEBs: 0 [01.228]ubi0: user volume: 9, internal volumes: 1, max. volumes count: 128 [01.235]ubi0: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 0 [01.243]ubi0: available PEBs: 0, total reserved PEBs: 1004, PEBs reserved for bad PEB handling: 40 [01.251]sunxi flash init ok [01.254]line:714 init_clocks __clk_init: clk pll_periph0x2 already initialized register fix_factor clk error [01.264]drv_disp_init request pwm success, pwm2:pwm2:0x2000c00. [01.281]drv_disp_init finish [01.283]boot_gui_init:start [01.286]set disp.dev2_output_type fail. using defval=0 [01.478]boot_gui_init:finish [01.891]LCD open finish partno erro : can't find partition bootloader 54 bytes read in 0 ms [02.052]bmp_name=bootlogo.bmp size 3072054 3072054 bytes read in 126 ms (23.3 MiB/s) [02.402]Loading Environment from SUNXI_FLASH... OK [02.435]out of usb burn from boot: not need burn key [02.460]update bootcmd [02.482]change working_fdt 0x7eaafda8 to 0x7ea8fda8 [02.503]update dts Hit any key to stop autoboot: 0 => sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss Unknown command 'sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss' - try 'help' => =>
2.要看哪个DTS节点的参数,就输入 fdt list +节点名称
比如查看整个/soc/的DTS:=> fdt list /soc/ soc@3000000 { #address-cells = <0x00000002>; #size-cells = <0x00000002>; compatible = "simple-bus"; ranges; sram_ctrl@3000000 { }; rtc_ccu@7090000 { }; clock@2001000 { }; clock@7010000 { }; interrupt-controller@10000000 { }; uart@2500000 { }; uart@2500400 { }; uart@2500800 { }; uart@2500c00 { }; uart@2501000 { }; uart@2501400 { }; ce@03040000 { }; s_cir@7040000 { }; ir@2003000 { }; deinterlace@5400000 { }; eth@4500000 { }; rtc@7090000 { }; dma-controller@3002000 { }; timer@2050000 { }; watchdog@6011000 { }; mbus-comtroller@3102000 { }; pmu { }; idle { }; pinctrl@2000000 { }; spi@4025000 { }; spi@4026000 { }; twi@2502000 { }; twi@2502400 { }; twi@2502800 { }; twi@2502c00 { }; ledc@2008000 { }; pwm@2000c00 { }; keyboard@2009800 { }; sid@3006000 { }; gpadc@2009000 { }; ths@02009400 { }; rtp@2009c00 { }; codec@2030000 { }; dummy_cpudai@203034c { }; sound@2030340 { }; rpaf-dsp@203034c { }; dmic@2031000 { }; sound@2031050 { }; sounddmic@2031060 { }; daudio@2032000 { }; sounddaudio0@20320a0 { }; daudio@2033000 { }; sounddaudio1@20330a0 { }; daudio@2034000 { }; sounddaudio2@20340a0 { }; hdmiaudio@20340a4 { }; spdif@2036000 { }; soundspdif@2036040 { }; g2d@5410000 { }; disp@5000000 { }; ve@1c0e000 { }; msgbox@0601f000 { }; lcd0@1c0c000 { }; sdmmc@4022000 { }; sdmmc@4020000 { }; sdmmc@4021000 { }; hdmi@5500000 { }; usbc0@0 { }; udc-controller@0x04100000 { }; ehci0-controller@0x04101000 { }; ohci0-controller@0x04101400 { }; usbc1@0 { }; ehci1-controller@0x04200000 { }; ohci1-controller@0x04200400 { }; pwm0@2000c10 { }; pwm1@2000c11 { }; pwm2@2000c12 { }; pwm3@2000c13 { }; pwm4@2000c14 { }; pwm5@2000c15 { }; pwm6@2000c16 { }; pwm7@2000c17 { }; vind@5800800 { }; tvd@05c00000 { }; tvd0@05c01000 { }; card0_boot_para@2 { }; card2_boot_para@3 { }; rfkill@0 { }; btlpm@0 { }; addr_mgt@0 { }; };
再比如看pwm0的设置则为:
=> fdt list /soc/pwm0 pwm0@2000c10 { compatible = "allwinner,sunxi-pwm0"; reg = <0x00000000 0x02000c10 0x00000000 0x00000004>; reg_base = <0x02000c00>; pinctrl-names = "active", "sleep"; pinctrl-0 = <0x00000056>; pinctrl-1 = <0x00000057>; status = "okay"; phandle = <0x00000030>; };
3.如果要修改某个节点的参数,则使用 fdt set 节点名称 参数名称 要修改的数值
如 fdt set /soc/disp dev0_do_hpd <0>4.改好后输入 boot 启动设备即可。
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*注:如果参数值是数字的话,要用"<>"括起来,如:
fdt set /soc/disp/ screen0_output_type <4>
如果是字符串的话要用引号引起来,如:
dt set /soc/disp/ boot_fb0 "000000007eb4d680,780,438,20,1e00,348,17c,438,2bc"
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这操作还不够方便,给UBOOT添加一个环境变量
replace_fdt=dtb,raw
再修改sys_partition.fex,添加一个名为dtb的分区,下载文件为正常的sunxi.fex。
更新dtb的时候 ,只需要用刷机工具更新DTB或区,或者在系统下使用dd把新的DTB写到dtb分区就行了。这是全志UBOOT自带的功能。
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