LS1088ARDB_PB boot with emmc configure as SD ?

[benoitmasse]

Hi,

I have a question about the configuration word.

If I generate an eMMC boot image for ls1088ARDB_PB, I can boot from eMMC  if I use qixis_reset eMMC.

But if I generate an SD boot image for ls1088ARDB_PB, I can boot from eMMC at power-on, and no need to use qixis_reset function.

WHY ?

That means, for my comprehension, that the CFG_RCW_SRC[6:0] can be set to 7'b100_0000 for both eMMC and SD.

In this case, the value 7'b100_0001 is useless.

Do I understand the behaviour correctly or I miss something ?

Thanks,

[yipingwang]

You understanding is correct, CFG_RCW_SRC[6:0] configuration can be set to 7'b100_0000 for both eMMC and SD on LS1088ARDB. When you use eMMC boot, please plug off SD card from LS1088ARDB.

[benoitmasse]

Thanks,

In our board we will use a LS2044A then my question is :

Can we replicate SD-eMMC desgin from LS1088ARDB (without the cpld) and set configuration word as

CFG_RCW_SRC[6:0] to 7'b100_0000 for both eMMC and SD ?

Thanks,

[yipingwang]

Please design LS2088A/LS2044A target board according to the reference manual, CFG_RCW_SRC[6:0] = 7'b100_0000 is for booting from a SD 2.0 card; CFG_RCW_SRC[6:0] = 7'b100_0001 is for booting from an eMMC.