Rockchip | 固件分区排列
翻译
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。
二、U-boot中的GPT分区表
U-boot支持标准的 GPT分区表格式。
三、默认存储图
Partition
| Start Sector
| Number of Sectors
| Partition Size
| PartNum in GPT
| Requirements
|
MBR
| 0
| 00000000
| 1
| 00000001
| 512
| 0.5KB
| | |
Primary GPT
| 1
| 00000001
| 63
| 0000003F
| 32256
| 31.5KB
| | |
loader1 | 64 | 00000040 | 7104 | 00001bc0 | 4096000 | 2.5MB | 1 | preloader (miniloader or U-Boot SPL) |
Vendor Storage
| 7168
| 00001c00
| 512
| 00000200
| 262144
| 256KB
| | SN, MAC and etc.
|
Reserved Space
| 7680
| 00001e00
| 384
| 00000180
| 196608
| 192KB
| | Not used
|
reserved1
| 8064
| 00001f80
| 128
| 00000080
| 65536
| 64KB
| | legacy DRM key
|
U-Boot ENV
| 8128
| 00001fc0
| 64
| 00000040
| 32768
| 32KB
| | |
reserved2
| 8192
| 00002000
| 8192
| 00002000
| 4194304
| 4MB
| | legacy parameter
|
loader2 | 16384 | 00004000 | 8192 | 00002000 | 4194304 | 4MB | 2 | U-Boot or UEFI |
trust | 24576 | 00006000 | 8192 | 00002000 | 4194304 | 4MB | 3 | trusted-os like ATF, OP-TEE |
boot（bootable must be set） | 32768 | 00008000 | 229376 | 00038000 | 117440512 | 112MB | 4 | kernel, dtb, extlinux.conf, ramdisk |
rootfs | 262144 | 00040000 | - | - | - | -MB | 5 | Linux system |
Secondary GPT
| 16777183
| 00FFFFDF
| 33
| 00000021
| 16896
| 16.5KB
| | |
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。
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)
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 \
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
