Chip select n memory bounds (DDR_CSn_BNDS)

[ybhao]

4–15
SAn
Starting address for chip select (bank) n . This value is compared against the 12 msbs of the 36-bit
address.
20–31
EAn
Ending address for chip select (bank) n. This value is compared against the 12 msbs of the 36-bit address.

#ifndef CONFIG_P2020RDB
#define CONFIG_SYS_DDR_CS0_BNDS 0x0000003f

how to understand the EA ， what's it uint?  

the P2020RDB have 1GB  at cs0 line， how does it relate to 0x3f？ 

thank you

[yipingwang]

DRAM configuration per device is 1GB, the address range is from 0x0_0000_0000 to 0x0_3fff_ffff, the 12 msbs of the 36-bit address is 0x03f, so the value of CONFIG_SYS_DDR_CS0_BNDS is 0x3f.