I can’t post a reply on this topic because it is locked, so I open a new one.
I have a Geode lx800 processor with a ite8888 pci-isa (pc104) bridge. In the future I will have two PC/104 boards. One with I/O ports access and another one with I/O ports and memory-mapped access.
I am able to read/write I/O ports with the first one :
ThreadCtl(_NTO_TCTL_IO, NULL); out8(address, data); // data = in8(address);
note : mmap_device_io() isn’t necessary on x86 systems
I have not the second board yet but still I’m trying PC/104 memory access with an oscilloscope (MEMW signal monitoring for PC/104 16 bits access).
Here’s my code:
Of course, my bios is configured to decode PC/104 memory address 0x0F0000.
There is no fluctuation on MEMW line…
I tried a 16-bits read also but with no more success.Same results with 8-bits read/write access (SMEMW, SMEMR).