Rockchip | 固件分区排列_rk ota dd

一、介绍

 在开放源代码支持中，Rockchip使用 GPT作为其主要分区表。我们将GPT存储在LBA0〜LBA63中。

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二、U-boot中的GPT分区表

U-boot支持标准的 GPT分区表格式。

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三、默认存储图

注1：如果preloader是miniloader，则loader2分区可用于uboot.img，trust分区可用于trust.img; 如果preloader是不带trust支持的SPL，则loader2分区可用于u-boot.bin，而trust分区不可用；如果preloader是具有trust支持的SPL（ATF或OPTEE），则loader2可用于u-boot.itb（包括u-boot.bin和trust二进制文件），而trust分区不可用。

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四、通过rkdeveloptool编写GPT分区表

rkdeveloptool db rkxx_loader_vx.xx.bin
rkdeveloptool gpt parameter_gpt.txt

其中parameter_gpt.txt包含分区信息：

CMDLINE: mtdparts=rk29xxnand:0x00001f40@0x00000040(loader1),0x00000080@0x00001f80(reserved1),0x00002000@0x00002000(reserved2),0x00002000@0x00004000(loader2),0x00002000@0x00006000(atf),0x00038000@0x00008000(boot:bootable),-@0x0040000(rootfs)

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五、通过U-boot写入GPT分区表

在u-boot console中，“ gpt”命令可用于写入gpt分区表：

gpt - GUID Partition Table
 
Usage:
gpt <command> <interface> <dev> <partitions_list>
 - GUID partition table restoration and validity check
 Restore or verify GPT information on a device connected
 to interface
 Example usage:
 gpt write mmc 0 $partitions
 gpt verify mmc 0 $partitions</code>

例如：

=> env set partitions name=rootfs,size=-,type=system
=> gpt write mmc 0 $partitions
Writing GPT: success!

注意：可以在u-boot console（使用“ env set”命令）或在u-boot的源代码中设置分区env，
例如：

include/configs/kylin_rk3036.h
#define PARTS_DEFAULT \
        "uuid_disk=${uuid_gpt_disk};" \
...
 
#undef CONFIG_EXTRA_ENV_SETTINGS
#define CONFIG_EXTRA_ENV_SETTINGS \
        "partitions=" PARTS_DEFAULT \

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六、通过U-Boot的fastboot写入GPT分区表

当前的上游u-boot包含fastboot协议支持。此版本的fastboot支持2种修改gpt分区表的方法：

（1）fastboot oem格式

它与u-boot控制台中的“ gpt write mmc 0 $ partitions”相同：

#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
        if (strncmp("format", cmd + 4, 6) == 0) {
                char cmdbuf[32];
                sprintf(cmdbuf, "gpt write mmc %x $partitions",
                        CONFIG_FASTBOOT_FLASH_MMC_DEV);
                if (run_command(cmdbuf, 0))
                        fastboot_tx_write_str("FAIL");
                else
                        fastboot_tx_write_str("OKAY");
        } else
#endif

PC命令：

$ fastboot oem format -i 0x2207
...
OKAY [  0.015s]
finished. total time: 0.015s

（2）fastboot flash gpt <gpt分区映像>

        if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
                printf("%s: updating MBR, Primary and Backup GPT(s)\n",
                       __func__);
                if (is_valid_gpt_buf(dev_desc, download_buffer)) {
                        printf("%s: invalid GPT - refusing to write to flash\n",
                               __func__);
                        fastboot_fail(response_str, "invalid GPT partition");
                        return;
                }
                if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
                        printf("%s: writing GPT partitions failed\n", __func__);
                        fastboot_fail(response_str,
                                      "writing GPT partitions failed");
                        return;
                }
                printf("........ success\n");
                fastboot_okay(response_str, "");
                return;

gpt分区映像可以由PC的gdisk工具生成，
例如：

$ dd if=/dev/zero of=disk.img bs=1M count=256
256+0 records in
256+0 records out
268435456 bytes (268 MB) copied, 0.151867 s, 1.8 GB/s
 
$ gdisk disk.img
GPT fdisk (gdisk) version 0.8.1
 
Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present
 
Creating new GPT entries.
 
Command (? for help): n
Partition number (1-128, default 1):
First sector (34-524254, default = 34) or {+-}size{KMGTP}:
Information: Moved requested sector from 34 to 2048 in
order to align on 2048-sector boundaries.
Use 'l' on the experts' menu to adjust alignment
Last sector (2048-524254, default = 524254) or {+-}size{KMGTP}:
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'
Command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT).
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.
$ dd if=disk.img of=gpt.img count=64
64+0 records in
64+0 records out
32768 bytes (33 kB) copied, 0.00075438 s, 43.4 MB/s

PC命令：

$ fastboot flash gpt gpt.img
target reported max download size of 117440512 bytes
sending 'gpt' (32 KB)...
OKAY [  0.006s]
writing 'gpt'...
OKAY [  0.025s]
finished. total time: 0.030s