因为change list文档中说BQ40Z50和R1是可以烧录R2的firmware的，
“The existing bq40z50 and bq40z50-R1 integrated circuits and evaluation modules (EVMs) can be
upgraded to bq40z50-R2 FW by downloading the .srec firmware file for v2.08 from TI.com. ”
如下所列的改动，是硬件的变动还是软件变动？ 当R1烧录R2的固件，是不是就有了下面表格中R2的功能了呢？
