recovery升级遇到的问题及其流程简单分析

这几天在测试RK3288平台的recovery升级功能，测试的是打包生成的update.img升级镜像。经过多次测试发现以下问题，kernel部分的logo没被更新。一般情况下原厂recovery升级都是正常的，不过是为了更好地解决问题，也是趁着这个机会去了解下recovery下流程。

recovery相关部分的代码路径

${code_root}/bootable/recovery
${code_root}/bootable/recovery/recovery.cpp
${code_root}/bootable/recovery/rkimage.cpp
${code_root}/frameworks/base/core/java/android/os/RecoverySystem.java

根据串口跟踪升级流程

这里贴出我从串口上取下来的一些关键Log打印

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 1408; [Func] : SetSdcardRootPath; InternalSD_ROOT: /mnt/internal_sd

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 1410; [Func] : SetSdcardRootPath; ExternalSD_ROOT: /mnt/external_sd failed to create /cache dir,err=File exists!

D/ [File] : bootable/recovery/recovery.cpp;[Line] : 2265; [Func] : main; to dump args befor get_args() : 1 argument(s) : /sbin/recovery

D/ [File] : bootable/recovery/recovery.cpp; [Line] : 604; [Func] : get_args; to dump 'boot' : command : status : recovery : stage :

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 655; [Func] : get_args; Got arguments from /cache/recovery/command

D/ [File] : bootable/recovery/recovery.cpp; [Line] : 2282; [Func] : main; to dump args after get_args() : 3 argument(s) : /sbin/recovery --update_rkimage=/mnt/usb_storage/USB_DISK2/udisk0/update.img --locale=zh_CN locale is [zh_CN] stage is [] reason is
[(null)] Recovery system v5.0

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 2379; [Func] : main; Recovery system v5.0, built at '15:49:43', on 'May 17 2016'. failed to create /mnt/external_sd dir,err=File exists!

W/ [File] : bootable/recovery/roots.cpp; [Line] : 145; [Func] : ensure_path_mounted; trying mount /dev/block/mmcblk1p1 to ntfs

W/ [File] : bootable/recovery/roots.cpp; [Line] : 161; [Func] : ensure_path_mounted; trying mount /dev/block/mmcblk1 to ntfs E:failed to mount /mnt/external_sd (No such device)

E/ [File] : bootable/recovery/roots.cpp; [Line] : 167; [Func] : ensure_path_mounted; failed to mount /mnt/external_sd (No such device) delay 2sec failed to create /mnt/external_sd dir,err=File exists!

W/ [File] : bootable/recovery/roots.cpp; [Line] : 145; [Func] : ensure_path_mounted; trying mount /dev/block/mmcblk1p1 to ntfs

W/ [File] : bootable/recovery/roots.cpp; [Line] : 161; [Func] : ensure_path_mounted; trying mount /dev/block/mmcblk1 to ntfs E:failed to mount /mnt/external_sd (No such device)

E/ [File] : bootable/recovery/roots.cpp; [Line] : 167; [Func] : ensure_path_mounted; failed to mount /mnt/external_sd (No such device) delay 2sec read cmdline Not enter sdboot! failed to create /mnt/external_sd dir,err=File exists!

W/ [File] : bootable/recovery/roots.cpp; [Line] : 145; [Func] : ensure_path_mounted; trying mount /dev/block/mmcblk1p1 to ntfs

W/ [File] : bootable/recovery/roots.cpp; [Line] : 161; [Func] : ensure_path_mounted; trying mount /dev/block/mmcblk1 to ntfs E:failed to mount /mnt/external_sd (No such device)

E/ [File] : bootable/recovery/roots.cpp; [Line] : 167; [Func] : ensure_path_mounted; failed to mount /mnt/external_sd (No such device) failed to create /metadata dir,err=File exists! [ 10.900450] EXT4-fs (mmcblk0p12): mounted filesbotem with ordc ed dmta
mo e. Opts: very" "--update_rkimage=/mnt/usb_storage/USB_DISK2/udisk0/update.img" "--locale=zh_CN"

findPackageAndMountUsbDevice : searchFile = /mnt/usb_storage/update.img

/dev/block/.

/dev/block/..

/dev/block/sda1

try to mount usb device at /dev/block/sda1 by vfat[   10.934452] FAT-fs (sda1): Volume was not properly unmounted. Some uab updateepackage..

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 2517; [Func] : main; to install rk_img : /mnt/usb_storage/update.img.

Finding update package...

=== UPDATE RKIMAGE===

Find and check firmware...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1286; [Func] : find_update_img; Update location: /mnt/usb_storage/update.img

the path is already mounted!

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1293; [Func] : find_update_img; Update file path: /mnt/usb_storage/update.img

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 514; [Func] : CheckImageFile; Local model: rk3288_box

Update model: rk3288_box

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 521; [Func] : CheckImageFile; Checking...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 361; [Func] : ch
c536
eck_image_crc; Check crc okay.

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1924; [Func] : install_rkimage; g_package_target=/mnt/usb_storage/update.img

!!! Please KEEP your USB cable or DC-in connected !!!

E:unknown volume for path [RU_PARTITION_MOUNT_PATH]

E/ [File] : bootable/recovery/roots.cpp; [Line] : 93; [Func] : ensure_path_mounted; unknown volume for path [RU_PARTITION_MOUNT_PATH]

E:unknown volume for path [SYSTEM_PARTITION_MOUNT_PATH]

E/ [File] : bootable/recovery/roots.cpp; [Line] : 93; [Func] : ensure_path_mounted; unknown volume for path [SYSTEM_PARTITION_MOUNT_PATH]

Update boot.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=boot  dest=/boot  offset=0

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 839; [Func] : write_image; dest isFile: 0

Check boot.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1086; [Func] : image_compare; src=boot  dest=/boot  offset=0

Update resource.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=resource  dest=/resource  offset=0

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 839; [Func] : write_image; dest isFile: 0

Check resource.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1086; [Func] : image_compare; src=resource  dest=/resource  offset=0

Update uboot.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=uboot  dest=/uboot  offset=0

E:Can't find uboot

E/ [File] : bootable/recovery/rkimage.cpp; [Line] : 819; [Func] : write_image; Can't find uboot

no uboot.img so ignore

Update trust.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=trust  dest=/trust  offset=0

E:Can't find trust

E/ [File] : bootable/recovery/rkimage.cpp; [Line] : 819; [Func] : write_image; Can't find trust

no trust.img so ignore

Update system...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=system  dest=/system  offset=0

E:Can't find system

E/ [File] : bootable/recovery/rkimage.cpp; [Line] : 819; [Func] : write_image; Can't find system

no boot.img so ignore

Update backup...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=backup  dest=/backup  offset=0

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 839; [Func] : write_image; dest isFile: 0

Check backup...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1086; [Func] : image_compare; src=backup  dest=/backup  offset=0

Update recovery.img...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 812; [Func] : write_image; src=recovery  dest=/recovery  offset=0

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 839; [Func] : write_image; dest isFile: 0

Check recovery...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1086; [Func] : image_compare; src=recovery  dest=/recovery  offset=0

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1496; [Func] : handle_update_script; Read script

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1512; [Func] : handle_update_script; Parse the script

line 3 col 58: syntax error, unexpected STRING, expecting $end

E:1 parse errors

E/ [File] : bootable/recovery/rkimage.cpp; [Line] : 1519; [Func] : handle_update_script; 1 parse errors

handle script error! ignore...

copy Bootloader...

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 612; [Func] : write_loader; src=bootloader  dest=/misc  offset=49152

I/ [File] : bootable/recovery/rkimage.cpp; [Line] : 662; [Func] : write_loader; dest isFile: 0

Installation complete.

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 2522; [Func] : main; to wipe /data.

Formatting /data...

Creating filesystem with parameters:

    Size: 1073741824

    Block size: 4096

    Blocks per group: 32768

    Inodes per group: 8192

    Inode size: 256

    Journal blocks: 4096

    Label:

    Blocks: 262144

    Block groups: 8

    Reserved block group size: 63

Created filesystem with 11/65536 inodes and 8536/262144 blocks

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 821; [Func] : finish_recovery; Saving locale "zh_CN"

Rebooting...

[   16.647164] SysRq : Emergency Remount R/O

[   16.649590] EXT4-fs (mmcblk0p12): re-mounted. Opts: (null)

[   16.651388] Emergency Remount complete

[   16.747856] cpufreq: cpufreq: reboot set core rate=1200000000, volt=1100000

[   16.748050] mmcblk mmc0:0001: Unbalanced pm_runtime_enable!

[   17.358818] dwc_otg_driver_shutdown: disconnect USB device mode

[   17.366720] Restarting system with command ''.

DDR Version 1.00 20150318

根据Log输出你可以对Recovery的升级过程有大体的了解，针对update.img的升级这里主要涉及recovery.cpp和rkimage.cpp，recovery.cpp是进入recovery升级调用的入口，rkimage.cpp是对update.img进行拆包升级的。这里想说明的是Log是很好帮助你分析流程和问题的工具，多对Log进行分析对你解决问题。

简单分析应用上层如何进入recovery升级

要想recovery工作，需要往"/cache/recovery/command"这个节点写命令，在Log我们可以发现如下参数，包括升级包的路径和本地语言。

I/ [File] : bootable/recovery/recovery.cpp; [Line] : 655; [Func] : get_args; Got arguments from /cache/recovery/command

D/ [File] : bootable/recovery/recovery.cpp; [Line] : 2282; [Func] : main; to dump args after get_args() :

              3 argument(s) :

              /sbin/recovery

              --update_rkimage=/mnt/usb_storage/USB_DISK2/udisk0/update.img

              --locale=zh_CN locale is [zh_CN]

stage is []

reason is [(null)]

这些参数如何通过上层应用写给/cache/recovery/command节点的，这里可以参考android.os.RecoverySystem这个类里面的相关方法。

那recovery里面有哪些可以操作的参数呢，相关的命令可以在recovery.cpp中找到声明。

static const struct option OPTIONS[] = {
{ "factory_mode", required_argument, NULL, 'f' },
{ "send_intent", required_argument, NULL, 's' },
{ "update_package", required_argument, NULL, 'u' },
{ "update_rkimage", required_argument, NULL, 'k' }, // support rkimage to update
{ "radical_update_package", required_argument, NULL, 'z' }, // to support ru_pkg to update
{ "wipe_data", no_argument, NULL, 'w' },
{ "wipe_cache", no_argument, NULL, 'c' },
{ "show_text", no_argument, NULL, 't' },
{ "wipe_all", no_argument, NULL, 'w'+'a' },
{ "just_exit", no_argument, NULL, 'x' },
{ "locale", required_argument, NULL, 'l' },
{ "stages", required_argument, NULL, 'g' },
{ "shutdown_after", no_argument, NULL, 'p' },
{ "fw_update", required_argument, NULL, 'f'+'w' },
{ "demo_copy", required_argument, NULL, 'd' },
{ "reason", required_argument, NULL, 'r' },
{ NULL, 0, NULL, 0 },
};

转换的过程读者可以看下recovery.cpp的main方法，这里就不贴代码了，通过传入参数，recovery会作出选择，本次是升级还是还原操作，是否擦除分区等等。至此上层应用到recovery的过程基本理清。

无法升级logo的问题的解决

RK3288平台的开机Logo是打包在resource.img中的，在生成镜像时会把resource.img打包到boot.img中，代码中是确实对boot.img中进行升级了。那么问题出在哪里呢？明明升级了但是却没有效果。

此时我注意到一个打印数据如下

bootmode = emmc
recovery filesystem table
=========================
0 /mnt/internal_sd vfat /dev/block/platform/ff0f0000.rksdmmc/by-name/user 0
1 /mnt/external_sd vfat /dev/block/mmcblk1p1 0
2 /system ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/system 0
3 /cache ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/cache 0
4 /metadata ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/metadata 0
5 /data ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/userdata 0
6 /cust ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/cust 0
7 /custom ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/custom 0
8 /radical_update ext4 /dev/block/platform/ff0f0000.rksdmmc/by-name/radical_update 0
9 /misc emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/misc 0
10 /uboot emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/uboot 0
11 /charge emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/charge 0
12 /resource emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/resource 0
13 /parameter emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/parameter 0
14 /boot emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/boot 0
15 /recovery emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/recovery 0
16 /backup emmc /dev/block/platform/ff0f0000.rksdmmc/by-name/backup 0
17 /tmp ramdisk ramdisk 0

resource也是有分区，是不是resource.img也需要单独升级呢？带着这样的的疑问，我做了下实验，在rkimage.cpp的install_rkimage方法添加升级resource.img的处理（如下），实验结论就是开机logo可以被更新了。

ui->Print("Update resource.img...\n");
result = write_image("resource", "/resource", 0);
if(result == -4) {
//some times, we not want to boot every time;
ui->Print("no resource.img so ignore\n");
}else if(result == 0) {
ui->Print("Check resource.img...\n");
result = image_compare("resource", "/resource", 0);
if(result) {
ui->Print("Failed(%d)\n", result);
goto update_error;
}
}else {
ui->Print("Failed(%d)\n", result);
goto update_error;
}*/

问题原因及结论：在工厂升级的时候把resource.img作为一个分区升级到板卡上了，后续如果想更新开机logo必须要把该分区更新。另外的解决办法就是resource.img分区不作为一个分区更新到板卡，和boot.img分区打包在一起即可。

转自：http://www.jianshu.com/p/1ebbdcb24d2f