Peter Stuge schrieb:
the manual states two separate memories: expansion rom and then the rest of the flash mem. I am somewhat sure it is not purely a PCI expansion ROM .
No it is definately not just an expansion ROM, but my point was that they designed it to hook into the system boot process with an expansion ROM that knew how to reach the rest of the flash.
More generally speaking the board is overkill for our purposes since we only need a much simpler FPGA and less flash memory, since no chipset currently decodes more than 1MB at 4G anyway. Also their design uses lots of flash chips which is not really neccessary today when much larger flash chips are available.
maybe one should look at the verilog code stuff.
So I did, the top 7 bits (31-25) of the board's BAR0 set which address it listens to (PCI config space 0x10) and bits 22-2 are taken from the PCI read cycle.
Bits 24-23 are ignored, so there are 2^23 effective addresses, each accessing a 32-bit word, total 32Mb.
As for access to the expansion ROM, the VHDL is not complete. Specifically the signal ROM_HIT isn't set anywhere. It's likely to be set in the generic Xilinx LogiCORE VHDL for PCI devices.
Intel does not sell the board but one might find the manual interesting since it deals with our issue on a sidenote I believe.
Sure, "all" that is needed to make such a PCI card is an FPGA and flash memory. :)
//Pete
sry this got misaddressed
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Quux