2009-01-19 Christian Franke <franke@computer.org>

2009-01-19  Christian Franke  <franke@computer.org>

	* disk/ata.c (GRUB_ATAPI_REG_*): New defines.
	(GRUB_ATAPI_IREASON_*): Likewise.
	(grub_ata_pio_write): Fix timeout error return.
	(grub_atapi_identify): Add grub_ata_wait () after cmd.
	(grub_atapi_wait_drq): New function.
	(grub_atapi_packet): New parameter `size'.
	Use grub_atapi_wait_drq () and direct write instead of
	grub_ata_pio_write ().
	(grub_atapi_read): Replace grub_ata_pio_read () by a loop which
	reads the number of bytes requested by the device for each DRQ
	assertion.
	(grub_atapi_write): Remove old implementation, return not
	implemented instead.