https://github.com/cisen/sourcecode-tockloader-00

问答

tbf的安装内存是如何确定的？

tockloader\tab.py的extract_app函数是解析tbf文件的入口
tbf文件解析的关键在tockloader\tbfh.py的header的初始化函数，它解析了tab的所有信息
解析完tbf就会调用_reshuffle_apps开始烧录app
根据链接的类型，使用flash_binary调用硬件串口接口或jlink版或 openocd版，使用openocd等命令将app烧录进主板

每次安装app都需要重装一次系统？

不是，链接id里面声明了app的安装地址，初始化进程的时候就会从该地址读取进程数据。而操作系统是0x000000的地址，比如


# boards/nordic/nrf52dk/chip_layout.ld
/* Memory Space Definitions, 512K flash, 64K ram */
MEMORY
{
rom (rx)  : ORIGIN = 0x00000000, LENGTH = 192K
prog (rx) : ORIGIN = 0x00030000, LENGTH = 320K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 64K
}

MPU_MIN_ALIGN = 8K;

- app的烧录地址是tockloader解析tbf文件计算得到的

**openocd flash的address是如何计算的？**
- 在`tockloader\board_interface.py`的`get_apps_start_address`函数，获取tbf的appaddr字段，默认地址是0x30000
- 各个板子可以根据自己的情况定内存位置，自定义是在`tockloader\board_interface.py`的`'apps_start_address': 0x20430000,`配置

**所有app flash进去的地址都是30000？**
- 是的，[tockloader](https://github.com/tock/tockloader/blob/5f0ea486c717106c430d66f9c75b0c4489f0bb3c/tockloader/main.py#L542)，使用虚拟内存，每个进程一个页目录
- tock说明

╔═══════════╤══════════════════════════════════════════╗ ║ Address │ Region Name Used | Allocated (bytes) ║ ╚0x20006000═╪══════════════════════════════════════════╝ │ ▼ Grant 948 | 948 0x20005C4C ┼─────────────────────────────────────────── │ Unused 0x200049F0 ┼─────────────────────────────────────────── │ ▲ Heap 0 | 4700 S 0x200049F0 ┼─────────────────────────────────────────── R │ Data 496 | 496 A 0x20004800 ┼─────────────────────────────────────────── M │ ▼ Stack 72 | 2048 0x200047B8 ┼─────────────────────────────────────────── │ Unused 0x20004000 ┴─────────────────────────────────────────── ..... 0x00030400 ┬─────────────────────────────────────────── F │ App Flash 976 L 0x00030030 ┼─────────────────────────────────────────── A │ Protected 48 S 0x00030000 ┴─────────────────────────────────────────── H

- 在tock里面的各个layout.id文件都声明：
```id
/* Memory Spaces Definitions, 448K flash, 64K ram */
/* Bootloader is at address 0x00000000 */
MEMORY
{
  rom (rx)  : ORIGIN = 0x00010000, LENGTH = 0x00020000
  prog (rx) : ORIGIN = 0x00030000, LENGTH = 0x00040000
  ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00020000
}

MPU_MIN_ALIGN = 8K;

tock的内存官方声明
Flash

Address Range	Length (bytes)	Content	Description
0x0-3FF	1024	Bootloader	Reserved flash for the bootloader. Likely the vector table.
0x400-0x5FF	512	Flags	Reserved space for flags. If the bootloader is present, the first 14 bytes are "TOCKBOOTLOADER".
0x600-0x9FF	1024	Attributes	Up to 16 key-value pairs of attributes that describe the board and the software running on it.
0xA00-0xFFFF	61.5k	Bootloader	The software bootloader provides non-JTAG methods of programming the kernel and applications.
0x10000-0x2FFFF	128k	Kernel	Flash space for the kernel.
0x30000-0x7FFFF	320k	Apps	Flash space for applications.

RAM

Address Range	Length (bytes)	Content	Description
0x20000000-0x2000FFFF	64k	Kernel and app RAM	The kernel links with all of the RAM, and then allocates a buffer internally for application use.

多个app是如何flash的？

在_reshuffle_apps函数，如果已经安装到板子上的，它还会从板子上重新读取bin数据，然后重新烧录
大部分的烧录的开始地址都是0x30000

cisen / blog

tockloader 源码相关 #906

问答

Flash

RAM