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二、编译全志A64的内核
1.查看帮助
- $cd lichee
- $ ./build.sh -h
- Top level build script for lichee
-
- Examples:
- 1. Set the config option
- $ ./build.sh config
- 2. Build lichee using preset config value
- $ ./build.sh
- 3. Pack a linux, dragonboard image
- $ ./build.sh pack
- 4. Build lichee using command argument
- $ ./build.sh -p <platform>
-
- flags:
- -p,--platform: platform to build, e.g. sun9iw1p1 (default: '')
- -k,--kernel: kernel to build, e.g. 3.3 (default: 'linux-3.4')
- -b,--board: board to build, e.g. evb (default: '')
- -m,--module: module to build, e.g. buildroot, kernel, uboot, clean (default: '')
- -h,--[no]help: show this help (default: false)
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2.利用build.sh配置内核,选择主板型号
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ ./build.sh config
-
- Welcome to mkscript setup progress
- All available chips:
- 0. sun50iw1p1
- Choice: 0
- All available platforms:
- 0. android
- 1. ubuntu
- 2. linuxqt
- Choice: 0
- All available kernel:
- 0. linux-3.10
- Choice: 0
- All available boards:
- 0. t1
- 1. t1_v1
- Choice: 0
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3.编译安卓内核
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ ./build.sh
- INFO: ----------------------------------------
- INFO: build lichee ...
- INFO: chip: sun50iw1p1
- INFO: platform: android
- INFO: kernel: linux-3.10
- INFO: board: t1
- INFO: output: out/sun50iw1p1/android/t1
- INFO: ----------------------------------------
- INFO: build buildroot ...
- external toolchain has been installed
- external toolchain_32 has been installed
- INFO: build buildroot OK.
- INFO: build kernel ...
- INFO: prepare toolchain ...
三.编译安卓源码
1.选择产品型号
我的产品型号是 tulip_t1,则选择:7
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/android$ source build/envsetup.sh
- including device/softwinner/common/vendorsetup.sh
- including device/softwinner/tulip-t1/vendorsetup.sh
- including device/softwinner/tulip-t1_v1/vendorsetup.sh
- including device/generic/mini-emulator-arm64/vendorsetup.sh
- including device/generic/mini-emulator-mips/vendorsetup.sh
- including device/generic/mini-emulator-x86/vendorsetup.sh
- including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh
- including device/generic/mini-emulator-x86_64/vendorsetup.sh
- including device/moto/shamu/vendorsetup.sh
- including device/asus/flo/vendorsetup.sh
- including device/samsung/manta/vendorsetup.sh
- including device/htc/flounder/vendorsetup.sh
- including sdk/bash_completion/adb.bash
-
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/android$ lunch
-
- You're building on Linux
- Lunch menu... pick a combo:
- 1. aosp_arm-eng
- 2. aosp_arm64-eng
- 3. aosp_mips-eng
- 4. aosp_mips64-eng
- 5. aosp_x86-eng
- 6. aosp_x86_64-eng
- 7. tulip_t1-eng
- 8. tulip_t1-user
- 9. tulip_t1_v1-eng
- 10. tulip_t1_v1-user
- 11. mini_emulator_arm64-userdebug
- 12. mini_emulator_mips-userdebug
- 13. mini_emulator_x86-userdebug
- 14. m_e_arm-userdebug
- 15. mini_emulator_x86_64-userdebug
- 16. aosp_shamu-userdebug
- 17. aosp_flo-userdebug
- 18. aosp_manta-userdebug
- 19. aosp_flounder-userdebug
- Which would you like? [aosp_arm-eng] 7
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2.拷贝安卓内核到源码目录
- $ extract-bsp
- /home/litin/Android/allwinner/cqa64_android_v5.1/android/device/softwinner/tulip-t1/bImage copied!
- /home/litin/Android/allwinner/cqa64_android_v5.1/android/device/softwinner/tulip-t1/modules copied!
3.开始编译安卓源码
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/android$ make -j8
-
- ============================================
- PLATFORM_VERSION_CODENAME=REL
- PLATFORM_VERSION=5.1.1
- TARGET_PRODUCT=tulip_t1
- TARGET_BUILD_VARIANT=eng
- TARGET_BUILD_TYPE=release
- TARGET_BUILD_APPS=
- TARGET_ARCH=arm64
- TARGET_ARCH_VARIANT=armv8-a
- TARGET_CPU_VARIANT=generic
- TARGET_2ND_ARCH=arm
- TARGET_2ND_ARCH_VARIANT=armv7-a-neon
- TARGET_2ND_CPU_VARIANT=cortex-a15
- HOST_ARCH=x86_64
- HOST_OS=linux
- HOST_OS_EXTRA=Linux-4.4.0-98-generic-x86_64-with-Ubuntu-14.04-trusty
- HOST_BUILD_TYPE=release
- BUILD_ID=LVY48E
- OUT_DIR=out
- ============================================
- Checking build tools versions...
- including ./abi/cpp/Android.mk ...
- including ./art/Android.mk ...
- .............................................................................
- Installed file list: out/target/product/tulip-t1/installed-files.txt
- Target system fs image: out/target/product/tulip-t1/obj/PACKAGING/systemimage_intermediates/system.img
- Running: mkuserimg.sh -s out/target/product/tulip-t1/system out/target/product/tulip-t1/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 1610612736 out/target/product/tulip-t1/root/file_contexts
- make_ext4fs -s -T -1 -S out/target/product/tulip-t1/root/file_contexts -l 1610612736 -a system out/target/product/tulip-t1/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/tulip-t1/system
- Creating filesystem with parameters:
- Size: 1610612736
- Block size: 4096
- Blocks per group: 32768
- Inodes per group: 8192
- Inode size: 256
- Journal blocks: 6144
- Label:
- Blocks: 393216
- Block groups: 12
- Reserved block group size: 95
- Created filesystem with 1969/98304 inodes and 140794/393216 blocks
- Install system fs image: out/target/product/tulip-t1/system.img
- out/target/product/tulip-t1/system.img+out/target/product/tulip-t1/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize=1644331392 blocksize=4224 total=552394391 reserve=16612992
-
- #### make completed successfully (01:35:12 (hh:mm:ss)) ####
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三、全志平台中编译的时候遇到的大坑
1.内核编译出错
- make[1]: 没有什么可以做的为 `dtbs'。
- CHK include/generated/compile.h
- CHK kernel/config_data.h
- LD drivers/net/wireless/rtl8188eu/built-in.o
- /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/out/sun50iw1p1/android/common/buildroot/external-toolchain/bin/aarch64-linux-gnu-ar: drivers/net/wireless/rtl8188eu/built-in.o: 权限不够
- make[4]: *** [drivers/net/wireless/rtl8188eu/built-in.o] 错误 1
- make[3]: *** [drivers/net/wireless/rtl8188eu] 错误 2
- make[3]: *** 正在等待未完成的任务....
- CC drivers/switch/switch_class.o
- CC drivers/thermal/thermal_core.o
- CC drivers/tty/tty_io.o
- CC drivers/tty/n_tty.o
- make[2]: *** [drivers/net/wireless] 错误 2
- make[1]: *** [drivers/net] 错误 2
- make[1]: *** 正在等待未完成的任务....
- SHIPPED drivers/tty/vt/defkeymap.c
- CC drivers/tty/vt/consolemap_deftbl.o
- CC drivers/tty/vt/defkeymap.o
- CC drivers/tty/serial/kgdboc.o
- CC drivers/tty/serial/sunxi-uart.o
- LD drivers/tty/serial/built-in.o
- LD drivers/tty/vt/built-in.o
- LD drivers/tty/built-in.o
- make: *** [drivers] 错误 2
- ERROR: build kernel Faile
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提示权限不够,用root权限编译才能顺利编译完成,真是无语,内核全部是普通用户,且都有读写的权限,竟然还要用root才能编译。。。
- Service:~/Android/allwinner/cqa64_android_v5.1/lichee$ ./build.sh pack
-
- INFO: packing firmware ...
- copying tools file
- copying configs file
- ./out/aultls32.fex
- ./out/aultools.fex
- ./out/cardscript.fex
- ./out/cardtool.fex
- ./out/diskfs.fex
- ./out/env_burn.cfg
- ./out/env.cfg
- ./out/image.cfg
- ./out/image_linux.cfg
- ./out/split_xxxx.fex
- ./out/sunxi.fex
- ./out/sys_config_1024x600.fex
- ./out/sys_config_1024x768.fex
- ./out/sys_config_800x480.fex
- ./out/sys_config.fex
- ./out/sys_config_hdmi_lcd_1080p.fex
- ./out/sys_config_tm121sds01.fex
- ./out/sys_config_vga_768p.fex
- ./out/sys_partition_dragonboard.fex
- ./out/sys_partition_dump.fex
- ./out/sys_partition.fex
- ./out/sys_partition_linux.fex
- ./out/sys_partition_private.fex
- ./out/test_config.fex
- ./out/toc0.fex
- ./out/toc1.fex
- ./out/usbtool.fex
- ./out/usbtool_test.fex
- copying boot resource
- copying boot file
- Script_to_dts: Can not find [sun50iw1p1-t1_v1.dts]. Will use common dts file instead.
- FATAL ERROR: Couldn't open output file /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/out/sun50iw1p1/android/common/sunxi.dtb: Permission denied #######权限不够
- Conver script to dts ok.
- merge_uboot: u-boot.fex will merge monitor.fex, generate u-boot.fex, mode secmonitor
- merge_uboot: num 746660 randto1k
- merge_uboot: num 41016 randto1k
- file1_len = b6800, file2_len = a400
- file[secmonitor] offset b6800,size a400
- merge_uboot:genrate /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/tools/pack/out/u-boot.fex ok
- merge_uboot: u-boot.fex will merge scp.fex, generate u-boot.fex, mode scp
- merge_uboot: num 104660 randto1k
- file1_len = c0c00, file2_len = 19c00
- file[scp] offset c0c00,size 19c00
- merge_uboot:genrate /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/tools/pack/out/u-boot.fex ok
- packing for android
- normal
- /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/tools/pack/pctools/linux/eDragonEx/
- /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/tools/pack/out
- Begin Parse sys_partion.fex
- Add partion boot-resource.fex BOOT-RESOURCE_FEX
- Add partion very boot-resource.fex BOOT-RESOURCE_FEX
- FilePath: boot-resource.fex
- FileLength=4f6400Add partion env.fex ENV_FEX000000000
- Add partion very env.fex ENV_FEX000000000
- FilePath: env.fex
- FileLength=20000Add partion boot.fex BOOT_FEX00000000
- Add partion very boot.fex BOOT_FEX00000000
- FilePath: boot.fex
- FileLength=f99000Add partion system.fex SYSTEM_FEX000000
- Add partion very system.fex SYSTEM_FEX000000
- FilePath: system.fex
- FileLength=1f0b7938Add partion recovery.fex RECOVERY_FEX0000
- Add partion very recovery.fex RECOVERY_FEX0000
- FilePath: recovery.fex
- FileLength=10c6000Add partion diskfs.fex DISKFS_FEX000000
- Add partion very diskfs.fex DISKFS_FEX000000
- FilePath: diskfs.fex
- .........................................................
- diskfs.fex Len: 0x200
- Vdiskfs.fex Len: 0x4
- open file arisc.fex Faied!
- BuildImage level_2 Failed 615
- BuildImg 615
- Dragon execute image.cfg Failed ! ArgCnt = 3, 615
- pack finish
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解决方法:同样是权限不够,导致打包失败,用以下命令即可成功。
sudo ./build.sh pack
百度一下,发现其他人也遇到这个问题,但原因不一:
(1)打包安卓系统遇到bootfex CreateFile failed 2和Dragon execute imagecfg Failed ! 错误
(2)求助!全志方案pack打包镜像出错,Dragon execute image.cfg Failed ! ArgCnt = 3, 400 [问题点数:20分,结帖人sgsxcwen]
3.pack打包的时候要求配置安卓镜像输出的路径“ERROR: please specify ANDROID_IMAGE_OUT env”
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ sudo ./build.sh pack
- [sudo] password for litin:
- INFO: packing firmware ...
- copying tools file
- copying configs file
- ./out/aultls32.fex
- ./out/aultools.fex
- ./out/cardscript.fex
- ./out/cardtool.fex
- ./out/diskfs.fex
- ./out/env_burn.cfg
- ./out/env.cfg
- ./out/image.cfg
- ./out/image_linux.cfg
- ./out/split_xxxx.fex
- ./out/sunxi.fex
- ./out/sys_config_1024x600.fex
- ./out/sys_config_1024x768.fex
- ./out/sys_config_800x480.fex
- ./out/sys_config.fex
- ./out/sys_config_hdmi_lcd_1080p.fex
- ./out/sys_config_tm121sds01.fex
- ./out/sys_config_vga_768p.fex
- ./out/sys_partition_dragonboard.fex
- ./out/sys_partition_dump.fex
- ./out/sys_partition.fex
- ./out/sys_partition_linux.fex
- ./out/sys_partition_private.fex
- ./out/test_config.fex
- ./out/toc0.fex
- ./out/toc1.fex
- ./out/usbtool.fex
- ./out/usbtool_test.fex
- copying boot resource
- copying boot file
- Script_to_dts: Can not find [sun50iw1p1-t1.dts]. Will use common dts file instead.
- iniparser: syntax error in /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/out/sun50iw1p1/android/common/../../../../tools/pack/out/sys_config_fix.fex (312):
- -> spi-cpha
- iniparser: syntax error in /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/out/sun50iw1p1/android/common/../../../../tools/pack/out/sys_config_fix.fex (313):
- -> spi-cpol
- iniparser: syntax error in /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/out/sun50iw1p1/android/common/../../../../tools/pack/out/sys_config_fix.fex (314):
- -> spi-cs-high
- .....................................................................................
- merge_uboot: u-boot.fex will merge monitor.fex, generate u-boot.fex, mode secmonitor
- merge_uboot: num 746660 randto1k
- merge_uboot: num 41016 randto1k
- file1_len = b6800, file2_len = a400
- file[secmonitor] offset b6800,size a400
- merge_uboot:genrate /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/tools/pack/out/u-boot.fex ok
- merge_uboot: u-boot.fex will merge scp.fex, generate u-boot.fex, mode scp
- merge_uboot: num 104660 randto1k
- file1_len = c0c00, file2_len = 19c00
- file[scp] offset c0c00,size 19c00
- merge_uboot:genrate /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/tools/pack/out/u-boot.fex ok
- packing for android
- ERROR: please specify ANDROID_IMAGE_OUT env
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解决方法:在pack文件里面配置安卓的编译输出路径“ANDROID_IMAGE_OUT”即可
- vi lichee/tools/pack/
-
- 添加下面路径即可
-
- ANDROID_IMAGE_OUT=~/Android/allwinner/cqa64_android_v5.1/android/out/target/product/tulip-t1_v1/
4.全志内核的配置文件在哪?
第一次使用全志平台,在编译内核的时候由于找不到内核配置文件,会让人找不到方向,其实它就在linux内核源码里面
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ ls linux-3.10/arch/arm64/configs/
- defconfig sun50iw1p1smp_android_defconfig sun50iw1p1smp_defconfig sun50iw1p1smp_min_defconfig
5.全志的fex系统配置文件在哪?
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ find . -name "sys_config.fex"
- ./tools/pack/chips/sun50iw1p1/configs/t1/sys_config.fex
- ./tools/pack/chips/sun50iw1p1/configs/t1_v1/sys_config.fex
- ./tools/pack/out/sys_config.fex
6.全志lvds屏幕怎样配置时序
1.标准时序图
2.现用的1024x768的lvds液晶屏幕数据手册以及sys_config.fex文件配置
7.编译内核的时候,提示rtl8723bs模块生成是权限不足
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ ./build.sh
- INFO: ----------------------------------------
- INFO: build lichee ...
- INFO: chip: sun50iw1p1
- INFO: platform: android
- INFO: kernel: linux-3.10
- INFO: board: t1
- INFO: output: out/sun50iw1p1/android/t1
- INFO: ----------------------------------------
- INFO: build buildroot ...
- external toolchain has been installed
- external toolchain_32 has been installed
- INFO: build buildroot OK.
- INFO: build kernel ...
- INFO: prepare toolchain ...
- Building kernel
- /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/linux-3.10/output/lib/modules/3.10.65
- lichee_chip = sun50iw1p1
-
- Using default config sun50iw1p1smp_android_defconfig ...
-
- scripts/kconfig/conf --silentoldconfig Kconfig
- drivers/net/wireless/bcmdhd/Kconfig:50:warning: defaults for choice values not supported
- CHK include/generated/uapi/linux/version.h
- CHK include/generated/utsrelease.h
- CC scripts/mod/devicetable-offsets.s
- CALL scripts/checksyscalls.sh
- GEN scripts/mod/devicetable-offsets.h
- HOSTCC scripts/mod/file2alias.o
- HOSTLD scripts/mod/modpost
- make[1]: 没有什么可以做的为 `dtbs'。
- CHK include/generated/compile.h
- GZIP kernel/config_data.gz
- CHK kernel/config_data.h
- LD drivers/net/wireless/rtl8188eu/built-in.o
- /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/out/sun50iw1p1/android/common/buildroot/external-toolchain/bin/aarch64-linux-gnu-ar: drivers/net/wireless/rtl8188eu/built-in.o: 权限不够
- make[4]: *** [drivers/net/wireless/rtl8188eu/built-in.o] 错误 1
- make[3]: *** [drivers/net/wireless/rtl8188eu] 错误 2
- make[3]: *** 正在等待未完成的任务....
- make[2]: *** [drivers/net/wireless] 错误 2
- make[1]: *** [drivers/net] 错误 2
- make[1]: *** 正在等待未完成的任务....
- make: *** [drivers] 错误 2
- ERROR: build kernel Failed
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错误原因:编译该wifi模块要用root权限,具体原因不明。
解决方法:从内核配置项注释掉8723相关选项,可以直接在
vi linux-3.10/arch/arm64/configs/sun50iw1p1smp_android_defconfig
由于config不允许直接注释,再次编译linux内核的时候会提示8723模块程序要怎样配置,这时选择"n"就行了。
- litin@linuxService:~/Android/allwinner/cqa64_android_v5.1/lichee$ ./build.sh
- INFO: ----------------------------------------
- INFO: build lichee ...
- INFO: chip: sun50iw1p1
- INFO: platform: android
- INFO: kernel: linux-3.10
- INFO: board: t1
- INFO: output: out/sun50iw1p1/android/t1
- INFO: ----------------------------------------
- INFO: build buildroot ...
- external toolchain has been installed
- external toolchain_32 has been installed
- INFO: build buildroot OK.
- INFO: build kernel ...
- INFO: prepare toolchain ...
- Building kernel
- /home/litin/Android/allwinner/cqa64_android_v5.1/lichee/linux-3.10/output/lib/modules/3.10.65
- lichee_chip = sun50iw1p1
-
- Using default config sun50iw1p1smp_android_defconfig ...
-
- scripts/kconfig/conf --silentoldconfig Kconfig
- drivers/net/wireless/bcmdhd/Kconfig:50:warning: defaults for choice values not supported
- *
- * Restart config...
- *
- *
- * Wireless LAN
- *
- Wireless LAN (WLAN) [Y/n/?] y
- USB ZD1201 based Wireless device support (USB_ZD1201) [N/m/y/?] n
- Wireless RNDIS USB support (USB_NET_RNDIS_WLAN) [N/m/y/?] n
- Enable WiFi control function abstraction (WIFI_CONTROL_FUNC) [N/y/?] n
- Broadcom FullMAC wireless cards support (BCMDHD) [M/n/y/?] m
- Firmware path (BCMDHD_FW_PATH) [/system/vendor/modules/fw_bcmdhd.bin] /system/vendor/modules/fw_bcmdhd.bin
- NVRAM path (BCMDHD_NVRAM_PATH) [/system/vendor/modules/nvram.txt] /system/vendor/modules/nvram.txt
- Enable Chip Interface
- > 1. SDIO bus interface support (BCMDHD_SDIO)
- choice[1]: 1
- Interrupt type
- > 1. Out-of-Band Interrupt (BCMDHD_OOB)
- 2. In-Band Interrupt (BCMDHD_SDIO_IRQ)
- choice[1-2?]: 1
- Broadcom IEEE802.11n embedded FullMAC WLAN driver (BRCMFMAC) [N/m/y/?] n
- IEEE 802.11 for Host AP (Prism2/2.5/3 and WEP/TKIP/CCMP) (HOSTAP) [N/m/y/?] n
- Marvell 8xxx Libertas WLAN driver support (LIBERTAS) [N/m/y/?] n
- Marvell WiFi-Ex Driver (MWIFIEX) [N/m/y/?] n
- Realtek 8188E USB WiFi (RTL8188EU) [N/m/y/?] (NEW) n
- Realtek 8723B SDIO or SPI WiFi (RTL8723BS) [N/m/y/?] (NEW) n
- Realtek 8723BS_VQ0 WiFi (RTL8723BS_VQ0) [N/m/y/?] (NEW) n
- Realtek 8189F SDIO WiFi (RTL8189FS) [N/m/y/?] (NEW) n
- #
- # configuration written to .config
- #
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8.利用“PhoenixUSBPro.exe”刷机一直没反应
串口输出信息如下
- shell@tulip-t1_v1:/ $ set pll start
- set pll end
- beign to init dram
- DRAM driver version: V1.0
- DRAM Type = 3 (2:DDR2,3:DDR3,6:LPDDR2,7:LPDDR3)
- DRAM clk = 672 MHz
- DRAM zq value: 003b3bbb
- rsb_send_initseq: rsb clk 400Khz -> 3Mhz
- PMU: AXP81X
- ddr voltage = 1500 mv
- DRAM single rank full DQ OK
- DRAM size = 1024 MB
- DRAM init ok
- init dram ok
问题分析:对比正常烧录固件,发现多了一个bootloader的启动信息
- set pll start
- set pll end
- beign to init dram
- DRAM driver version: V1.0
- DRAM Type = 3 (2:DDR2,3:DDR3,6:LPDDR2,7:LPDDR3)
- DRAM clk = 672 MHz
- DRAM zq value: 003b3bbb
- rsb_send_initseq: rsb clk 400Khz -> 3Mhz
- PMU: AXP81X
- ddr voltage = 1500 mv
- DRAM single rank full DQ OK
- DRAM size = 1024 MB
- DRAM init ok
- init dram ok
-
-
- U-Boot 2014.07 (Sep 16 2015 - 18:08:34) Allwinner Technology
-
- uboot commit : ad5f4db37d600c2566902ed7e243eaa9b670a563
-
- uboot:normal mode
- without secure monitor
- [ 2.522]pmbus: ready
- axp read error
- probe axp81X failed
- axp_probe error
- [ 2.556]PMU: cpux 408 Mhz,AXI=136 Mhz
- PLL6=600 Mhz,AHB1=200 Mhz, APB1=100Mhz AHB2=200Mhz MBus=400Mhz
- DRAM: 496 MiB
- fdt addr: 0x56eb8460
- Relocation Offset is: 15f0a000
- In: serial
- Out: serial
- Err: serial
- gic: normal mode
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问题解决:重新编译镜像文件,特别是bootloader部分,可能由于某些原因修改了bootloader信息,只有恢复正常的bootloader即可正常烧录镜像。
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