Function disable_gpr0

util/ifdtool/ifdtool.c:1683–1709

}

static void disable_gpr0(const char *filename, char *image, int size)
{
	struct fpsba *fpsba = find_fpsba(image, size);
	if (!fpsba)
		exit(EXIT_FAILURE);

	uint32_t gpr0_offset = get_gpr0_offset();
	if (gpr0_offset == 0xffffffff) {
		fprintf(stderr, "Disabling GPR0 not supported on this platform\n");
		exit(EXIT_FAILURE);
	}

	union gprd reg;
	/* If bit 31 is set then GPR0 protection is enable */
	reg.value = fpsba->pchstrp[gpr0_offset];
	if (!reg.data.write_protect_en) {
		printf("GPR0 protection is already disabled\n");
		return;
	}

	printf("Value at GPRD offset (%d) is 0x%08x\n", gpr0_offset, reg.value);
	print_gpr0_range(reg);
	/* 0 means GPR0 protection is disabled */
	fpsba->pchstrp[gpr0_offset] = 0;
	write_image(filename, image, size);
	printf("GPR0 protection is now disabled\n");
}

/*
 * Helper function to parse the FPT to retrieve the FITC start offset and size.