请问C6455 BOOT模式选择EMIFA ROM boot，对应的CFGGP[2:0]应该如何配置？

datasheet 
2.4.1 Boot Modes Supported
EMIFA 8-bit ROM boot (BOOTMODE[3:0] = 0100b)
配的是BOOTMODE管脚，CFGGP[2：0] 与EMIFA boot无关。
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在datasheet中有如下 如下描述：
1. Configuration GPI (CFGGP[2:0]) (AEA[2:0])
These pins are latched during reset and their values are shown in the DEVSTAT register. These values can be used by software routines for boot operations.
2. CFGGP[2:0] pins must be set to 000b during reset for proper operation of the PCI boot mode。
如何理解？
 
 

有些bootmode下要用到这些脚来区分相应的配置。比如SRIO boot mode，而EMIFA的boot mode不需要其它配置。
For Serial RapidIO boot, BOOTMODE2 (L26 pin) is used in conjunction with CFGGP[2:0] (T26, U26,
and U25 pins, respectively) to determine the device address within the RapidIO network.
BOOTMODE2 is the MSB of the address, while CFGGP[2:0] are used as the three LSBs—giving the
user the opportunity to have up to 16 unique device IDs.
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