Stops poluting screen with a lot of "block-size: exception -21".

It causes similar hang as CD on at least the qemu.

	validity.

	* grub-core/net/drivers/ieee1275/ofnet.c: Likewise.

	detection.

	would be otherwise excluded.

	i386-ieee1275.

	* grub-core/disk/ieee1275/ofdisk.c (grub_ofdisk_open): Get the block
	size of the disk.
	* (grub_ofdisk_get_block_size): New function.
	* (grub_ofdisk_prepare): Use the correct block size.
	* (grub_ofdisk_read): Likewise.
	* (grub_ofdisk_write): Likewise.
	* include/grub/ieee1275/ofdisk.h (grub_ofdisk_get_block_size):
	New proto.

* include/grub/arc/arc.h (grub_arc_iterate_devs_hook_t): New type.
(grub_arc_iterate_devs): Add hook_data argument.
* include/grub/ata.h (grub_ata_dev_iterate_hook_t): New type.
(struct grub_ata_dev.iterate): Add hook_data argument.
* include/grub/device.h (grub_device_iterate_hook_t): New type.
(grub_device_iterate): Add hook_data argument.
* include/grub/disk.h (grub_disk_dev_iterate_hook_t): New type.
(struct grub_disk_dev.iterate): Add hook_data argument.
(grub_disk_dev_iterate): Likewise.
* include/grub/gpt_partition.h (grub_gpt_partition_map_iterate):
Likewise.
* include/grub/msdos_partition.h (grub_partition_msdos_iterate):
Likewise.
* include/grub/partition.h (grub_partition_iterate_hook_t): New
type.
(struct grub_partition_map.iterate): Add hook_data argument.
(grub_partition_iterate): Likewise.
* include/grub/scsi.h (grub_scsi_dev_iterate_hook_t): New type.
(struct grub_scsi_dev.iterate): Add hook_data argument.

Update all callers.

	grub_error properly.
	* grub-core/disk/ieee1275/nand.c (grub_nand_write): Likewise.
	* grub-core/disk/loopback.c (grub_loopback_write): Likewise.

	* grub-core/lib/ieee1275/datetime.c (grub_get_datetime): Likewise.
	(grub_set_datetime): Likewise.

	increment.

	* grub-core/disk/ieee1275/ofdisk.c (quiesce): Removed.
	(grub_ofdisk_init): Don't do quiesce.

	(grub_ofdisk_fini): Quiesce USB devices.

	machines.
	Tested by: Paulo Flabiano Smorigo.
	Crucial information about API supplied by: Coleen <Last name unknown>.
	Reviewed by: Coleen <Last name unknown>.

	GRUB_IEEE1275_FLAG_NO_TREE_SCANNING_FOR_DISKS is set.
	* grub-core/kern/ieee1275/cmain.c (grub_ieee1275_find_options): Set
	GRUB_IEEE1275_FLAG_NO_TREE_SCANNING_FOR_DISKS on IBM hardware.
	* include/grub/ieee1275/ieee1275.h (grub_ieee1275_flag): New enum value
	GRUB_IEEE1275_FLAG_NO_TREE_SCANNING_FOR_DISKS.

	* grub-core/disk/ieee1275/nand.c (grub_nand_open): Use prefix nand.

	name as if it was an alias.

	on it.

	* grub-core/kern/ieee1275/ieee1275.c (grub_ieee1275_write): Make buffer
	const void *.
	* include/grub/ieee1275/ieee1275.h (grub_ieee1275_write): Likewise.
	* grub-core/disk/ieee1275/ofdisk.c (grub_ofdisk_read): Move open
	and seek loginc to ...
	(grub_ofdisk_prepare): ... here.
	(grub_ofdisk_write): Implement.

	prefix.
	(grub_ofdisk_open): Check and discard ieee1275 prefix.
	* grub-core/kern/ieee1275/openfw.c (grub_ieee1275_encode_devname):
	Add ieee1275 prefix.

	guidelines.

	* grub-core/kern/dl.c (grub_dl_check_license): New function.
	(grub_dl_load_core): Use grub_dl_check_license.
	* include/grub/dl.h (GRUB_MOD_SECTION): New macro.
	(GRUB_MOD_LICENSE): Likewise.
	(GRUB_MOD_DUAL_LICENSE): Likewise.
	All modules updated.

	* grub-core/disk/ieee1275/ofdisk.c (ofdisk_hash_add_real): New function.
	(ofdisk_hash_add): New argument curcan. All users updated.

	All users updated.
	* disk/loopback.c (grub_loopback): Remove has_partitions.
	All users updated.
	(options): Remove partitions. All users updated.
	* util/grub-fstest.c (fstest): Don't pass "-p" to loopback.
	* util/i386/pc/grub-setup.c (setup): copy partition table only when
	actual partition table is found.

	* grub-core/disk/ieee1275/ofdisk.c (last_devpath): New variable.
	(last_ihandle): Likewise.
	(ofdisk_hash_ent): New member shortest.
	(ofdisk_hash_add): Add canonical path too.
	(scan): New function.
	(grub_ofdisk_iterate): Iterate over hashed entries.
	(compute_dev_path): Don't add :0.
	(grub_ofdisk_open): Don't really open the disk.
	(grub_ofdisk_close): Avoid closing unrelated disk.
	(grub_ofdisk_read): Implement reopen logic.
	* grub-core/kern/ieee1275/openfw.c (grub_ieee1275_canonicalise_devname):
	New function.
	* include/grub/ieee1275/ieee1275.h (grub_ieee1275_canonicalise_devname):
	New proto.