Kernel

See #14569 for the initial discussion. For now, hiding an applet requires setting the size to 0. It would be nice if we had an explicit way to hide it instead.

Now that we have the checklocks analyzer, we should annotate values that are lock-protected with an appropriate checklocks attribute.

可以做的PR:

• 支持IAR IDE
• UART_V2 驱动支持 control 修改参数，如波特率
• 硬件 IIC 驱动支持
• 以太网 接口驱动
• USB 接口驱动

• The set_mode_X() HIL functions need to support returning an error if hardware does not support that mode or if the implementation cannot put the hardware in to that mode at that time. See for an example where panic is used instead of returning an error https://github.com/tock/tock/pull/2629/files.

Describe the bug
the bzimage package can't unpack kernels compress with xz. This is because when I wrote it I was not sure how to find
the compressed part and used a simple minded search.

To Reproduce
create a bzImage but enable XZ compression in the kernel (yep, it's still called a bzimage)
use the kexec command with debug and note you see this:
2022/02/02 21:13:15 Failed to unpa