No GD-ROM, Can't read MBR from IDE by LBA

[polyfusion]

Trying to get this to work, hoping someone can provide some guidance...

Have a XCKDIY board with a 2.5 HDD mounted onto it. It has an oscillator (and a resistor) already attached.

The Dreamcast has the "boot_loader_unlock_G1_IGR_dbs_nogdrom.bios" flashed, and I believe it's ok, as I get the DEV bootscreen, and Dreamshell then loads ok from the SD card.

However, in the bootup screen, I can see the message:

Checking for G1 ATA devices...
Can't read MBR from IDE by LBA

Then some messages relating to the loading of the SD card, which it then does sucessfully.

When I go into ISO loader, the HDD isn't available to select.

The HDD was formatted in FAT32, and I have a DS folder loaded to the root of the HDD. I put the megavolt85 "DS_CORE.BIN" file on the root of the DS folder, and removed other BIN files from the root.

I think I followed the same as pstationBG in this thread:

http://www.dc-swat.ru/forum/printthread.php?tid=2250

Anything else I should try?

Thanks.