This renames the dcdofs config option in the imx-image tool to ivtofs.  dcdofs
is a misnomer. The DCD (Device Configuration Data) is only one part of the data
linked into the IVT (Image Vector Table), but the meaning of the option is
really the latter, not the former.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Read leveling delays are being specified as zero, so they are as good
as disabled and can be safely dropped.

Gate training delay is specified as 4/128 tCK for both data
slices. This setting, when applied to Data Byte 1, makes that slice
unusable* during POR startup which is somehow is mitigated by
double-reset hack in DCD.

Dropping gate training delays allows both VF610 Tower board and ZII
VF610 Dev board to sucessfully PoR-boot without the need for double
resetting of the DDRMC.

* The board fails to boot. When examined via JTAG in such a state
  only even bytes of DDR memory are functional.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Both zii-vf610-dev and vf610-twr boards have same DDR layout. Since
provenance of those custom settings is unclear, drop them in favor of
what vf610-twr board does.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Some of the settings for VFxxx boards appear to be in violation of the
parameters specified by DDR chip's datasheet, so fix the code to
reconcile the differences. The changes are:

In vf610-ddr-cr-default.imxcfg:

   - CR31: t_XSDLL is 468, should be 512
   - CR161 t_ODTH8 (R & W) is 2, should be 6

In flash-header-zii-vf610-dev.imxcfg:

   - CR12: WRLAT is 5, CL is 3,should be 5 and 6
   - CR13: t_RC is 6, should be 21
   - CR14: use default, more conservative t_FAW of 20

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

U-Boot was originally used as a source of DCD for VFxxx, so update our
settings against latest upstream (sha1:
b8aa55c) to reconcile the
differences.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

A number of VFxxx boards copy DDR layout/design of vf610-twr board and
they all share DDR settings. Move those settings to a common file to
avoid code duplication.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

VFxxx support code in Barebox is written assuming a particular clock
setup in mind and all of the supported boards use it. Move the DCD
code responsible for that setup to a shared file to avoid code
duplication.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

A number of VFxxx boards copy DDR layout/design of vf610-twr board and
they all share DDR PHY settings. Move those settings to a common file
to avoid code duplication.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

A number of VFxxx boards copy DDR layout/design of vf610-twr board and
they all share IOMUX settings. Move those settings to a common file
to avoid code duplication.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Remove various bits of debug code, commented DCD commands and
separators as a small clean-up in preparation for commits that would
follow.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Reading the manual more carefully discovers a different logic for the
DCD 'check' command. They use the term "until". In order to get the
manual and the software in sync, this change switches to the term
"until" as well. Changing must happen at compiler and interpreter level
to make it work.

Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add support for ZII VF610 Dev based designs such as:

    - VF610 Dev, revision B
    - VF610 Dev, revision C
    - CFU1, revision A
    - SPU3, revision A
    - SCU4 AIB, revision C

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>