Embedded driver support for reading model from flash memory

[petrohi]

In this PR we add embedded driver support for reading model from on-board flash memory.

The driver follows model description to first load the program and then each constant in the description order. The binary file to program the flash is prepared by concatenating tprog and tdata files. Following is the example where we first prepare the manifest and then load and run the model:

flash_init();

struct flash flash;
int status = flash_open(&flash);

if (status != XST_SUCCESS)
    return -1;

error_t error = ERROR_NONE;

struct driver driver;
error = driver_init(&driver);

if (error)
    return -1;

struct model resnet_model;

memcpy(&resnet_model.arch, &driver.arch, sizeof(struct architecture));
resnet_model.prog.size = 2064296;

resnet_model.consts_size = 1;
resnet_model.consts[0].base = 0;
resnet_model.consts[0].size = 71341;

resnet_model.inputs_size = 1;
strncpy(resnet_model.inputs[0].name, "x:0", MAX_STRING_SIZE);
resnet_model.inputs[0].base = 0;
resnet_model.inputs[0].size = 1024;

resnet_model.outputs_size = 1;
strncpy(resnet_model.outputs[0].name, "Identity:0", MAX_STRING_SIZE);
resnet_model.outputs[0].base = 32;
resnet_model.outputs[0].size = 2;

error = driver_load_model_from_flash(&driver, &resnet_model, &flash);

if (error)
    return -1;

error = driver_load_model_input_from_flash(&driver, &resnet_model, "x:0",
                                            &flash);

if (error)
    return -1;

error = driver_run(&driver, false, false, false, false);

if (error)
    return -1;

error =
    driver_print_model_output_vectors(&driver, &resnet_model, "Identity:0");

if (error)
    return -1;

Also:

• Compiler to produce tmodel file that includes program size in bytes;
• CMOD A7 architecture;
• Arty A7-100T architecture.

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #431: Embedded driver support for reading model from flash memory.