LayerscapeのトピックRe: eMMC flash programmer fails when DDR disabled on LS1088A - Custom Board

eMMC flash programmer fails when DDR disabled on LS1088A - Custom Board

BenQT — Mon, 17 Nov 2025 13:12:38 GMT

Hi everyone,

I'm trying to program eMMC with cwflash.py but I'm facing an initialization failure even though the command (like fl_dump) completes.

1. What I'm doing:
I want to dump the first sector (512 bytes), so I run:

The strange part:
- The capacity of my eMMC is 7.3GB but info just 3.6
- The dump say DONE but immediately fails with "init error"

2. Change I made

Because my DDR fails to initialize (DDR: timeout while waiting for D_INIT), I followed the official documentation to
- Commented out DDR init call
- Set sw_address = 0x18000000 (OCRAM) in Config_Flash_Device()
- Reloaded board and flash programmer.

Do I need to disable more than init_ddr() or somethings? Pls let me know

Thank you in advance!

Best regards,

Re: eMMC flash programmer fails when DDR disabled on LS1088A - Custom Board

June_Lu — Thu, 20 Nov 2025 03:56:49 GMT

Please kindly follow the INSTALL\Freescale\CW4NET_v2020.06\CW_ARMv8\ARMv8\Help\PDF\ARMv8_Targeting_Manual.pdf, 8.6 Board Recovery to flash the first image.

But if you open the "Target Initialization File", you could find:

# Add eMMC device

fl.add_device({"alias": "mmc", "name": "MMCP1xxx_LSCH3_v3", "address": 0x00000000, "ws_address": 0x80000000, "ws_size": 0x1FFFF, "geometry": "8x1", "controller": "eSDHC"})

"ws_address": 0x80000000 is the DDR address, if the DDR fails to initialize (DDR: timeout while waiting for D_INIT), you could not use the flash programmer.

Thanks

Re: eMMC flash programmer fails when DDR disabled on LS1088A - Custom Board

BenQT — Fri, 21 Nov 2025 05:04:20 GMT

Hello June,
Thank you for your response. Currently, our custom board is using a 16-bit DDR4 interface, and this is causing the INIT_DDRC() process to fail and prevents it from completing.
Therefore, based on the description in the LS1088A-RDB README and section 7.5 of the ARMv8 Targeting Manual, I attempted to switch to using eSDHC instead of DMA to avoid relying on DDR.

I would like to confirm the following:

1. Is switching to eSDHC a feasible approach?

2. If we use DDR with a 3200 MT/s and a 16-bit width, what modifications do I need to make to the initialization file?

Re: eMMC flash programmer fails when DDR disabled on LS1088A - Custom Board

June_Lu — Mon, 24 Nov 2025 09:24:01 GMT

Given the complexity and size of the eSDHC programming algorithm, earlier attempts to implement it did not succeed.

For the DDR issue, have you passed the DDR validation?

Thanks