[U-Boot] [PATCH] Add Boundary Devices Nitrogen6X boards

[Benoît Thébaudeau]

On Tuesday, February 19, 2013 10:53:48 PM, Eric Nelson wrote:
> On 02/19/2013 01:52 PM, Benoît Thébaudeau wrote:
> > Hi Eric,
> >
> > On Tuesday, February 19, 2013 9:20:48 PM, Eric Nelson wrote:
> > [--snip--]
> >> diff --git a/board/boundary/nitrogen6x/1066mhz_4x128mx16.cfg
> >> b/board/boundary/nitrogen6x/1066mhz_4x128mx16.cfg
> >> new file mode 100644
> >> index 0000000..45b8879
> >> --- /dev/null
> >> +++ b/board/boundary/nitrogen6x/1066mhz_4x128mx16.cfg
> > [--snip--]
> >> +DATA 4, MX6_MMDC_P0_MDPDC, 0x00020036
> >> +DATA 4, MX6_MMDC_P0_MDCFG0, 0x555B7974
> >                                      ^A?
> >> +DATA 4, MX6_MMDC_P0_MDCFG1, 0xDB538F64
> >> +DATA 4, MX6_MMDC_P0_MDCFG2, 0x01FF00DB
> >> +DATA 4, MX6_MMDC_P0_MDRWD, 0x000026D2
> >> +DATA 4, MX6_MMDC_P0_MDOR, 0x005B1023
> >                                    ^A?
> >> +DATA 4, MX6_MMDC_P0_MDOTC, 0x09444040
> >> +DATA 4, MX6_MMDC_P0_MDPDC, 0x00025576
> >> +DATA 4, MX6_MMDC_P0_MDASP, 0x00000027
> >> +DATA 4, MX6_MMDC_P0_MDCTL, 0x831A0000
> >> +DATA 4, MX6_MMDC_P0_MDSCR, 0x04088032
> >> +DATA 4, MX6_MMDC_P0_MDSCR, 0x00008033
> >> +DATA 4, MX6_MMDC_P0_MDSCR, 0x00428031
> >> +DATA 4, MX6_MMDC_P0_MDSCR, 0x19308030
> >> +DATA 4, MX6_MMDC_P0_MDSCR, 0x04008040
> >> +DATA 4, MX6_MMDC_P0_MPZQHWCTRL, 0xA1390003
> >> +DATA 4, MX6_MMDC_P1_MPZQHWCTRL, 0xA1390003
> >> +DATA 4, MX6_MMDC_P0_MDREF, 0x00005800
> >> +DATA 4, MX6_MMDC_P0_MPODTCTRL, 0x00022227
> >> +DATA 4, MX6_MMDC_P1_MPODTCTRL, 0x00022227
> >> +DATA 4, MX6_MMDC_P0_MPDGCTRL0, 0x42720306
> >> +DATA 4, MX6_MMDC_P0_MPDGCTRL1, 0x026F0266
> >> +DATA 4, MX6_MMDC_P1_MPDGCTRL0, 0x4273030A
> >> +DATA 4, MX6_MMDC_P1_MPDGCTRL1, 0x02740240
> >> +DATA 4, MX6_MMDC_P0_MPRDDLCTL, 0x45393B3E
> >> +DATA 4, MX6_MMDC_P1_MPRDDLCTL, 0x403A3747
> >> +DATA 4, MX6_MMDC_P0_MPWRDLCTL, 0x40434541
> >> +DATA 4, MX6_MMDC_P1_MPWRDLCTL, 0x473E4A3B
> >> +DATA 4, MX6_MMDC_P0_MPWLDECTRL0, 0x0011000E
> >> +DATA 4, MX6_MMDC_P0_MPWLDECTRL1, 0x000E001B
> >> +DATA 4, MX6_MMDC_P1_MPWLDECTRL0, 0x00190015
> >> +DATA 4, MX6_MMDC_P1_MPWLDECTRL1, 0x00070018
> >> +DATA 4, MX6_MMDC_P0_MPMUR0, 0x00000800
> >> +DATA 4, MX6_MMDC_P1_MPMUR0, 0x00000800
> >> +DATA 4, MX6_MMDC_P0_MDSCR, 0x00000000
> >> +DATA 4, MX6_MMDC_P0_MAPSR, 0x00011006
> > [--snip--]
> >
> > tXS = tXPR = 170 ns -> 91 nCK -> 91 - 1 -> 0x5A.
> >
> 
> Thanks Benoît,
> 
> I was going to bring this up in a separate thread.
> 
> While working through the details of our 800MHz
> variants (Solo, Dual-Lite), and x256mx16 variants,
> I re-worked these numbers and it seems that we
> have an off-by-one issue with those fields.

Probably because it has been missed that the bit-field value is the number of
clock cycles minus 1.

> According to the JEDEC spec and data sheets,
> both tXS and tXPR should be 10nS greater than tRFC.

Indeed, or more precisely, max(5 nCK, tRFC + 10 ns).

> Since the nominal clock for i.MX6 is 528MHz (1.89nS),

I used 532 MHz because this is a more standard value, and I found several close
different values in the documentation, so in the doubt, I chose the worst case.
With 528 MHz, the bit-field value would be 0x59.

> this should be a delta of 6 clocks, not 5.

Delta with what?

> This change should apply to mx6q_4x_mt41j128.cfg as well.

Sure.

> There are some other things in that file that should
> be fixed as well. The biggest among them is the settings
> for P1_MPWLDECTRL0/1.

Note that in this series, I have only reviewed the register values that changed
in my series, and only for 1066mhz_4x128mx16.cfg.

> These settings are indicative of a fly-by topology,
> which isn't used on SABRE Lite, and I don't think
> is used on SABRE SD.
> 
> 	DATA 4 0x021b480c 0x00440044
> 	DATA 4 0x021b4810 0x00440044
> 
> This was the primary thing that caused crashes
> under stress on SABRE Lite and led to our flurry of
> calibration tests as discussed here:
> 
> 	http://boundarydevices.com/i-mx-6dq-u-boot-updates/

OK. I had not looked in detail into this.

> Should we take this up in a separate thread? It seems
> un-related to our Nitrogen6X board.

As you prefer. This is related to this series, but a very specific subject per
se.

Best regards,
Benoît