[U-Boot] Problem w/ SATA/IDE on Kirkwood _88F6281_ board:

[David Purdy]

On Mon, Apr 2, 2012 at 12:11 AM, Prafulla Wadaskar <prafulla at marvell.com>
wrote:
>
>
> I remember there was some delay issue on SATA, since processor in this
platform is running at lower clock, (may be) this could be one of parameter
to be considered.
> May be Albert can have some more inside on this.
>
> Regards..
> Prafulla . . .

Hi Prafulla and hopefully Albert,

1 possibility ruled out, 1 tiny piece improved, 1 major problem still
there, & few questions...

0.  Latest code in git shows the same behavior...  that isn't the issue...

1.  Adjusting some of the timings in drivers/block/mvsata_ide.c has allowed
me to apparently solve a _small_ fraction of the problem.  I can now get it
to consistently/reliably honor the 'ide reset' command.  (before this
timing adjustment, I would frequently see:
..................................
Pogov4> ide reset

Reset IDE: ide_preinit failed
``````````````````````````````````
... so this is one minor part of it that no longer seems a problem.


2. The two 'no IRQ' errors that I see here still persist:
..................................
Reset IDE: Bus 0: OK Bus 1: OK
  Device 0: Model: TOSHIBA MK1655GSX  Firm: FG010D Ser#:  X9AHTNGQT
            Type: Hard Disk
            Supports 48-bit addressing
            Capacity: 152627.8 MB = 149.0 GB (312581808 x 512)
Error (no IRQ) dev 0 blk 16: status 0x7f
No Powersaving mode 7F
Error (no IRQ) dev 0 blk 0: status 0x7f
  Device 1: not available
``````````````````````````````````
These apparently come from common/cmd_ide.c .  The offsets shown in the
DEBUG output look to me to be the correct ones, referencing the Marvell
docs.

I can't find a meaning for 'status 0x7f', though.

Again, any ideas or hints of what to examine would be appreciated.


3.  Prafulla, could a problem w/ my  kwbimage.cfg file cause timing
problems?   Could the incorrect SoC identification (showing as a 6281
instead of a 6192) cause a problem due to some registers being misread
somehow?

Regards and thanks,

Dave