[coreboot] can AAI be used in flashrom?

[Bao, Zheng]

The AAI (Auto Address Increment Programming) command (0xAD) can be found
in SST25VF080B. I am wondering if it is available in every SPI chip. If
yes, the SB600 pragramming would be much faster than doing it one byte
at a time. I tested on my board with SB600. I don't make a patch because
I am not sure I can do that.

Zheng

int sb600_spi_write(struct flashchip *flash, uint8_t *buf)
{
    int rc = 0, i;
    int total_size = flash->total_size * 1024;
    uint8_t cmd[8] = {0xAD, 0x00, 0x00, 0x00};

/* Erase first */
    printf("Erasing flash before programming... ");
    flash->erase(flash);
    printf("done.\n");

cmd[4] = buf[0];
    cmd[5] = buf[1];

spi_disable_blockprotect();
    spi_write_enable();
    sb600_spi_command(6, 0, cmd, 0);

printf("Programming flash");
    for (i = 2, buf += 2; i < total_size; i+=2, buf+=2) {

/* spi_byte_program(i, *buf); */
    	cmd[1] = buf[0];
    	cmd[2] = buf[1];
    	sb600_spi_command(3, 0, cmd, 0);
    	/* wait program complete. */
    	if (i % 0x8000 == 0)
    		printf(".");
    	while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
    		;
    }
    printf(" done.\n");
    spi_write_disable();

return rc;
}