In file geneepromfs.c line 111, the file should be opened for writing in a binary mode. I tried to compile and run it on Windows 7 64-bit using mingw32 and I got corrupted output files (eeprom images) every time. When opening in "wb" mode, everything works as it should.

if ((OutputFilePointer = fopen(CommandLineOptions.OutputFilename, "wb")))

I'm trying to use this code to support SPI EEPROM / SRAM devices on an AVR ATmega platform.
The inherent pointer size is 16 bits, and many of the advanced pointer arithmetic calculations (which assume 32 bits) used in the code are going to fail.

For example the FileAllocationTable = (void *)BaseAddress; assignment converts BaseAddress into a 16 bit pointer in the avr-gcc and avr-libc world.

int32_t EEFS_LibInitFS(EEFS_InodeTable_t *InodeTable, uint32_t BaseAddress)
{
    EEFS_FileAllocationTable_t         *FileAllocationTable;
    EEFS_FileAllocationTableHeader_t    FileAllocationTableHeader;
    EEFS_FileAllocationTableEntry_t     FileAllocationTableEntry;
    uint32_t                            i;
    int32_t                             ReturnCode;

    EEFS_LIB_LOCK;
    if (InodeTable != NULL) {

        /* Load the File Allocation Table Header from EEPROM */
        FileAllocationTable = (void *)BaseAddress;

Before I cut into the existing code and risk introducing bugs into your tested release and make it difficult to for me to support, do you have any suggestions?

In the Makefile of geneepromfs, when linking using gcc on 64 bits host, it also needs to get the -m32 option so it can pass to ld -m elf_i386:

LOPT = -lm -m32

compilation of eefstool failed
Not know BDMlib.h library. I am compiling at linux (Debian)

comet@raspberrypi:~/eefs/tools/eefstool $ make
gcc -O -g -Wall  -D_ix86_ -mbe32 -march=armv7 -I./inc -I../../inc -I../../drivers/standalone_driver -I/usr/arm-linux-gnueabihf/include/ -I/opt/rtems-4.10/include -c ./src/eefstool_driver_bdm.c
./src/eefstool_driver_bdm.c:49:10: fatal error: BDMlib.h: No such file or directory
   49 | #include <BDMlib.h>
      |          ^~~~~~~~~~
compilation terminated.