Booting LS1020A from eMMC

dainiuszilys · ‎07-21-2018

Hello,

I want to boot LS1020A from eMMC (SanDisk SDINBDG4-8G chip, 3.3V I/O), but unsuccessfully for a while:

RCW is 0_0100_0000, and I see a 200kHz clock on eMMC CLK; But no any other lines has activity (cmd looks like floating, dat0=1). RESET_REQ drops down every 3mS.

If I connect card reader to the same eMMC lines (while CPU is in reset), PC recognizes memory, I can write/read content.

If I connect uSD card in parallel with the same content (PBL from 0x1000 address), RESET_REQ become 1, CPU starts booting.

What could be wrong?

Thanks for any notes in advance.

ufedor · ‎07-24-2018

> RESET_REQ drops down every 3mS.

This is "normal" behaviour if the PBL is unable to recognize correct RCW preamble which corresponds to "blank" eMMC device.