[U-Boot] [PATCH RESEND 0/4] Add CONFIG_SPL_NAND_IDENT

[Jörg Krause]

RESEND because adding U-Boot NAND maintainer (Scott Wood) on Cc.

When adding SPL support to a custom i.MX6ULL board with Toshiba
TC58NVG0S3 NAND chip the MXS NAND SPL loader failed with "Failed to
identify". This reason is that the SPL MXS NAND driver only supports
ONFi-compliant NAND chips and the mentioned Toshiba NAND chip is
non-ONFi.

This patch set makes `nand_get_flash_type()` from `nand_base.c` public,
so it can be used by any SPL NAND driver, introduced a new config option
`CONFIG_SPL_NAND_IDENT` to enable the lookup for supported NAND chips in
the chip ID list. Finally, the MXS NAND SPL driver is refactored so that
the original ONFi-only identification routine is enabled by default. For
non-ONFi NAND chips the newly introduced config option can be used.

In my setup the binary size of `u-boot-spl.bin` is increased by about
13 kB when `CONFIG_SPL_NAND_IDENT` is enabled. As the i.MX6, as well as
the i.MX28, both have an OCRAM of 128 kB the increase in the binary size
is reasonable.

Jörg Krause (4):
  mtd: nand: export nand_get_flash_type function
  spl, nand: add option CONFIG_SPL_NAND_IDENT to lookup for supported
    NAND chips
  mtd: nand: mxs_nand_spl: refactor mxs_flash_ident
  mtd: nand: mxs_nand_spl: add mxs_flash_full_ident

 README                          |  4 ++++
 drivers/mtd/nand/Makefile       |  1 +
 drivers/mtd/nand/mxs_nand_spl.c | 37 ++++++++++++++++++++++++++++++++++++-
 drivers/mtd/nand/nand_base.c    |  3 ++-
 include/linux/mtd/rawnand.h     | 10 +++++++---
 scripts/config_whitelist.txt    |  1 +
 6 files changed, 51 insertions(+), 5 deletions(-)

-- 
2.15.1