disk: make get_partition_info() always available to disk.c

Now that get_device_and_partition() always calls get_partition_info()
when disk.c is compiled, we must always compile the function, rather
than ifdef it away.

The implementation must be conditional based on CONFIG_CMD_* etc., since
that's what e.g. part_dos.c uses to ifdef out get_partition_info_dos();
CONFIG_DOS_PARTITION can be enabled even without those commands being
enabled.

Technically, this change is required before Rob's "disk/part: introduce
get_device_and_partition" patch. However, at least when the compiler
optimizer is turned on, it isn't required before then in practice,
since get_device_and_partition() calls get_dev(), which is stubbed out
in disk.c under exactly the same conditions that get_partition_info()
is not compiled, and hence the compiler never generates code for the
call to the missing function. However, in my later patch "disk:
get_device_and_partition() "auto" partition and cleanup", the optimizer
doesn't succeed at this, and may attempt to reference the undefined
function.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: Add CONFIG_CMD_* etc. ifdefs around the implementation.
combine block device load commands into common function

All the raw block load commands duplicate the same code. Starting with
the ide version as it has progress updates convert ide, usb, and scsi boot
commands to all use a common version.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
disk/part: check bootable flag for DOS partitions

Determine which partitions are bootable/active. In the partition listing,
print "Boot" for partitions with the bootable/active flag set.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
disk/part: introduce get_device_and_partition

All block device related commands (scsiboot, fatload, ext2ls, etc.) have
simliar duplicated device and partition parsing and selection code. This
adds a common function to replace various implementations.

The new function has an enhancement over current versions. If no device
or partition is specified on the command line, the bootdevice env variable
will be used (scsiboot does this).

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
ext4: remove init_fs/deinit_fs

There's no real need to expose this and it can be removed by using a static
allocation.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
cmd_extX: use common get_device_and_partition function

Convert ext2/4 load, ls, and write functions to use common device and
partition parsing function. With the common function "dev:part" can come
from the environment and a '-' can be used in that case.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
cmd_fat: use common get_device_and_partition function

Convert fatload, fatls, and fatinfo to use common device and partition
parsing function. With the common function "dev:part" can come from the
environment and a '-' can be used in that case.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
cmd_disk: use common get_device_and_partition function

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
cmd_zfs: use common get_device_and_partition function

Convert zfsload and zfsls to use common device and partition parsing
function. With the common function "dev:part" can come from the
environment and a '-' can be used in that case.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
cmd_reiser: use common get_device_and_partition function

Convert reiserload and reiserls to use common device and partition parsing
function. With the common function "dev:part" can come from the
environment and a '-' can be used in that case.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
disk: introduce get_device()

This patch introduces function get_device(). This looks up a
block_dev_desc_t from an interface name (e.g. mmc) and device number
(e.g. 0). This function is essentially the non-partition-specific
prefix of get_device_and_partition().

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v4: Rebased.
v3: New patch.
disk: get_device_and_partition() "auto" partition and cleanup

Rework get_device_and_partition() to:
a) Implement a new partition ID of "auto", which requests that U-Boot
   search for the first "bootable" partition, and fall back to the first
   valid partition if none is found. This way, users don't need to
   specify an explicit partition in their commands.
b) Make use of get_device().
c) Add parameter to indicate whether returning a whole device is
   acceptable, or whether a partition is mandatory.
d) Make error-checking of the user's device-/partition-specification
   more complete. In particular, if strtoul() doesn't convert all
   characters, it's an error rather than just ignored.

The resultant device/partition returned by the function will be as
follows, based on whether the disk has a partition table (ptable) or not,
and whether the calling command allows the whole device to be returned
or not.

(D and P are integers, P >= 1)

D
D:
  No ptable:
    !allow_whole_dev: error
    allow_whole_dev: device D
  ptable:
    device D partition 1
D:0
  !allow_whole_dev: error
  allow_whole_dev: device D
D:P
  No ptable: error
  ptable: device D partition P
D:auto
  No ptable:
    !allow_whole_dev: error
    allow_whole_dev: device D
  ptable:
    first partition in device D with bootable flag set.
    If none, first valid paratition in device D.

Note: In order to review this patch, it's probably easiest to simply
look at the file contents post-application, rather than reading the
patch itself.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[swarren: Rob implemented scanning for bootable partitions. I fixed a
couple of issues there, switched the syntax to ":auto", added the
error-checking rework, and ":0" syntax for the whole device]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v4: Squashed into Rob's partition-scanning patch. Rebased.
v3: New patch.
disk: part_efi: range-check partition number

Enhance get_partition_info_efi() to range-check the partition number.
This prevents invalid partitions being accessed, and prevents access
beyond the end of the gpt_pte[] array.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v4: Rebased.
v3: No change.
v2: New patch.
disk: part_efi: parse and store partition UUID

Each EFI partition table entry contains a UUID. Extend U-Boot's struct
disk_partition to be able to store this information, and modify
get_partition_info_efi() to fill it in.

The implementation of uuid_string() was derived from the Linux kernel,
tag v3.6-rc4 file lib/vsprintf.c function uuid_string().

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v4: Rebased.
v3: Provided pointer to source of uuid_string() code in commit description.
v2: Add #ifdef CONFIG_PARTITION_UUIDS around all new code and struct fields.
disk: part_msdos: parse and store partition UUID

The MSDOS/MBR partition table includes a 32-bit unique ID, often referred
to as the NT disk signature. When combined with a partition number within
the table, this can form a unique ID similar in concept to EFI/GPT's
partition UUID.

This patch generates UUIDs in the format 0002dd75-01, which matches the
format expected by the Linux kernel.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v4: Rebased.
v3: No change.
v2: New patch.
cmd_part: add partition-related command

This implements the following:

part uuid mmc 0:1
  -> print partition UUID
part uuid mmc 0:1 uuid
  -> set environment variable to partition UUID
part list mmc 0
  -> list the partitions on the specified device

"part uuid" can be useful when writing a bootcmd which searches all
known devices for something bootable, and then wants the kernel to
use the same partition as the root device, e.g.:

part uuid ${devtype} ${devnum}:${rootpart} uuid
setenv bootargs root=PARTUUID=${uuid} ...

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v4: Rebased.
v3:
* Rebased on top of u-boot/ext4 and Rob Herring's get_device_and_partition
  patches.
* Implemented "part list" sub-command.
v2:
* validate that CONFIG_PARTITION_UUID is defined when CONFIG_CMD_PART is
tegra: enable CONFIG_CMD_PART

This is extremely likely to be used from the boot.scr that Tegra's default
bootcmd locates and executes.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
ARM: tegra: define CONFIG_SYS_BOOTMAPSZ

This define indicates the size of the memory region where it is safe
to place data passed to the Linux kernel (ATAGs, DTB, initrd). The
value needs to be:

a) Less than or equal to RAM size.
b) Small enough that the area is not within the kernel's highmem region,
   since the kernel cannot access ATAGs/DTB/initrd from highmem.
c) Large enough to hold the kernel+DTB+initrd.

256M seems large enough for (c) in most circumstances, and small enough
to satisfy (a) and (b) across any possible Tegra board. Note that the
user can override this value via environment variable "bootm_mapsize"
if needed.

The advantage of defining BOOTMAPSZ is that we no longer need to define
variable fdt_high in the default environment. Previously, we defined
this to prevent the DTB from being relocated to the very end of RAM,
which on most Tegra systems is within highmem, and hence which would
cause boot failures. A user can still define this variable themselves
if they want the FDT to be either left in-place wherever loaded, or
copied to some other specific location. Similarly, there should no
longer be a strict requirement for the user to define initrd_high if
using an initrd.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
ARM: tegra: use standard variables to define load addresses

Currently, Tegra's default environment uses non-standard variables to define
where boot scripts should load the kernel, FDT, and initrd. This change both
changes the variable names to match those described in U-Boot's README, and
shuffles their values around a little so that the values make a little more
sense; see comments in the patch for rationale behind the values chosen.

Note that this patch does remove the old non-standard variable "fdt_load" from
the default environment, so this patch requires people to change their boot
scripts.

Signed-off-by: Stephen Warren <swarren@nvidia.com>