[RFC PATCH 0/7] spl: Use common function for loading/parsing images

[Sean Anderson]

This series adds support for loading all image types (Legacy, FIT (with
and without LOAD_FIT_FULL), and i.MX) to the MMC, SPI, NOR, NET, FAT,
and EXT load methods. It does this by introducing a helper function
which handles the minutiae of invoking the proper parsing function, and
reading the rest of the image.

Hopefully, this will make it easier for load methods to support all
image types that U-Boot supports, without having undocumented
unsupported image types. I applied this to several loaders which were
invoking spl_load_simple_fit and/or spl_parse_image_header, but I did
not use it with others (e.g. DFU/RAM) which had complications in the
mix.

Here's some bloat-o-meter for j7200_evm_a72_defconfig with ext4 support
enabled:

add/remove: 1/0 grow/shrink: 2/4 up/down: 224/-232 (-8)
Function                                     old     new   delta
spl_load                                       -     176    +176
spl_fit_read                                  60     104     +44
spl_load_image_ext                           364     368      +4
spl_nor_load_image                           120     108     -12
spl_spi_load_image                           280     232     -48
spl_load_image_fat                           320     264     -56
spl_mmc_load                                 712     596    -116
Total: Before=264476, After=264468, chg -0.00%

ext4 support is +48 bytes, because the original image support was so
bare-bones (just legacy/raw images). For most boards with a few load
methods (where one of them isn't ext4), this series should be no bloat
or a net negative. However, in the worst case this series will add
150-180 bytes.

I haven't tested most of this, so this series is marked RFC. I had a
nand conversion in here as well, but dropped due to difficulties
outlines in [1].

[1] https://lore.kernel.org/u-boot/c2ea7097-9e85-b9ec-e404-bd46eb83dd5b@seco.com/


Sean Anderson (7):
  spl: Add generic spl_load function
  spl: Convert ext to use spl_load
  spl: Convert fat to spl_load
  spl: Convert mmc to spl_load
  spl: Convert net to spl_load
  spl: Convert nor to spl_load
  spl: Convert spi to spl_load

 common/spl/spl.c     | 61 ++++++++++++++++++++++++++++++++++++
 common/spl/spl_ext.c | 24 ++++++++++-----
 common/spl/spl_fat.c | 36 ++++------------------
 common/spl/spl_mmc.c | 73 ++++----------------------------------------
 common/spl/spl_net.c | 24 +++------------
 common/spl/spl_nor.c | 35 ++++-----------------
 common/spl/spl_spi.c | 48 +++++------------------------
 include/spl.h        | 30 +++++++++++++++++-
 8 files changed, 137 insertions(+), 194 deletions(-)

-- 
2.35.1.1320.gc452695387.dirty