[avrdude-dev] Writing to SPI Flash

[Paul Archer]

Hi all,

I am trying to use avrdude to write to SPI flash. A datasheet that has
all the opcodes can be found here:
http://www.numonyx.com/Documents/Datasheets/M25PE40.pdf

I am using the Xilinx parrallel port programmer.

I created the following part:
part
    id                   = "spiflash";
    desc              = "SPI Flash Chip";
    has_jtag         = no;
    chip_erase_delay = 9000;
    pgm_enable       = "0 0 0 0  0 1 1 0";
    chip_erase       = "1 1 0 0  0 1 1 1";

    timeout     = 200;
    cmdexedelay     = 25;
    synchloops      = 32;

    memory "flash"
        paged           = yes;
        size            = 4096;
        page_size       = 256;
        num_pages       = 16;
        min_write_delay = 4500;
        max_write_delay = 20000;
        read            = "  0    0    0    0     0    0    1   1  ",
                          " a23  a22  a21  a20    a19  a18  a17 a16",
                          " a15  a14  a13  a12    a11  a10  a9  a8 ",
                          " a7   a6   a5   a4     a3   a2   a1  a0 ",
                          " o    o    o    o      o    o    o   o";

        write           = "  0    1    0    0     0    0    0   0  ",
                          " a23  a22  a21  a20    a19  a18  a17 a16",
                          " a15  a14  a13  a12    a11  a10  a9  a8 ",
                          " a7   a6   a5   a4     a3   a2   a1  a0 ",
                          " i    i    i    i      i    i    i   i";
        ;
    ;

When using this config I get the error:
avrdude: error at avrdude_spi_flash.conf:20: too many opcode bits for
instruction

This is due to the read opcode being more then 32 bits.

Is there a way to program SPI flash using avrdude. Or will I need to
hack avrdude
to add support for this. (In which case where is the best place to start,
other then increasing 32 bits to say 64 bits)

-- 
----
Regards
Paul Archer
address@hidden