/* Perform a signature comparison with the mmio address io_addr. This address should have been obtained by ioremap. Returns 1 on a match.  */
int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length)
/* Perform a signature comparison with the mmio address io_addr. This address should have been obtained by ioremap. Returns 1 on a match.  */
int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length)
{
	while (length--) {
		if (readb(io_addr) != *signature)
			return 0;
		io_addr++;
		signature++;
	}
	return 1;
}