P1020RDB-PD booting mode and eLBC signal configuration

[hyoungkikim]

Hi

i tested eLBC LWB-N Singals? with a P1020RDB-PD board

when i boot a board? from? NOR Flash,? ?eLBC singal LWE0-N, LWE1-N? works well and its default value is high

i checked with u-boot command with mm.w 0xec000000,

because NOR has no Data write without erase, so no harm to NOR and i? checked LWE0-N? at Nor Flash, and LWE1-N at? SW2[8]

but when i booted from SD-CARD ,? LWE-1 dosen't work,? during reset mode, it worked ,? i? switched SW2[8] to down and saw the signal with oscilloscope, the signal goes high, but after reset time , it goes low? ( on the contray in NOR booting , after reset it goes high , i think? becase? LWB-1 singal is active low)

i tested it because? my custom board booted with NAND ,? the LWB-1 signal doesn't work when i used? eBLC to connect 16bit- SRAM

if i am wrong , please let me know,? ?

thank you sincerely

[June_Lu]

If the P1020RDB-PD works well when boot from NOR flash, maybe you could refer the configuration of the P1020RDB-PD.

You could read out the register value booting from NOR flash and compare the differences between your board(Or booting from other mode) and P1020RDB-PD.