If you plan to submit patches, you should check out a copy from Subversion to make sure you have the latest bits.
如果要提交补丁,则应该检查一下版本服务器,以确保你拥有的是最新版本。
2
A checksum is a count of the number of bits in a transmission unit that is included with the unit so that the receiver can check to see whether the same number of bits arrived.
校验和是传输单位里二进制码(比特)的总数,因此接收者可以检验是否一样的比特数达到。
3
It is used to set baud rate, parity check, number of data bits, stop bit.