tftp filesystem support

[Sascha Hauer]

Handling tftp files has been special in barebox since it needs a special
tftp command. This series implements tftp as a regular filesystem, so no
special handling for tftp anymore.

Unfortunately there is no directory read support in tftp, so a mounted
tftp directory will only show an empty directory, but despite what 'ls'
says the files are really there and can (mostly) be accessed like every
other file. The exception to this is that lseek is not possible on tftp
files which means that bootm needs a quirk.

Sascha

Sascha Hauer (5):
      Add suport for tftp as a filesystem
      make uimages work on tftpfs
      net: let net_udp_get_payload return void *
      add string for -ETIMEDOUT
      copy_file: limit progress bar to sensible limits

 common/misc.c   |    2 +-
 common/uimage.c |   25 +++
 fs/Kconfig      |    4 +
 fs/Makefile     |    1 +
 fs/tftp.c       |  644 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/net.h   |    2 +-
 lib/copy_file.c |    5 +-
 7 files changed, 678 insertions(+), 5 deletions(-)
 create mode 100644 fs/tftp.c