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1. old method: open UART and close UART whenever we need to get information from BMC.
new method: open UART at beginning, then we use the UART(TTY) device directly.
2. old method: use onlp_i2c_readw() to get all QSFP/SFP's eeprom data, it spends 128 times i2c access time.
new method: use OOM's sysfs
3. reduce the UART(TTY) retry time and timeout time
4. add PSU's serial number information