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From: Peng Fan <van.freenix@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/2] mx6slevk: imximage.cfg: update to fix tINIT3 and tIH-CA violations
Date: Tue, 5 Apr 2016 16:53:28 +0800	[thread overview]
Message-ID: <20160405085326.GA30800@linux-7smt.suse> (raw)
In-Reply-To: <20160403180605.GL23166@bill-the-cat>

Hi Tom,

I know this already merged to i.mx tree. I still have a question for the
tIH-CA violation.

In my side, the value is ok. clk is 400MHz.
(0x30 * 256.0) * (1000000000000.0/400000000.0) = 468.75ps.
And according to spec, to 800M date rate, the minimum tIH value is 290ps.

So I wonder how in your side it is tIH-CA violation.

Regards,
Peng.

On Sun, Apr 03, 2016 at 02:06:05PM -0400, Tom Rini wrote:
>On Sun, Apr 03, 2016 at 07:22:30PM +0200, Stefano Babic wrote:
>> 
>> 
>> On 01/04/2016 23:54, Tom Rini wrote:
>> > Having had a similar board and memory part under logic analyzer, a
>> > tINIT3 violation was measured.  The fix was involved keeping tXPR and
>> > SDE_to_RST at the power-on defaults and setting RST_to_CKE the JEDEC
>> > value for LPDDR2.  There was also a tIH-CA violation and this was
>> > resolved by writing the default value in rather than what the script
>> > here uses.
>> > 
>> > Cc: Fabio Estevam <fabio.estevam@nxp.com>
>> > Cc: Peng Fan <peng.fan@nxp.com>
>> > Signed-off-by: Tom Rini <trini@konsulko.com>
>> > ---
>> >  board/freescale/mx6slevk/imximage.cfg |    4 ++--
>> >  1 file changed, 2 insertions(+), 2 deletions(-)
>> > 
>> > diff --git a/board/freescale/mx6slevk/imximage.cfg b/board/freescale/mx6slevk/imximage.cfg
>> > index 16ea597..c77bbde 100644
>> > --- a/board/freescale/mx6slevk/imximage.cfg
>> > +++ b/board/freescale/mx6slevk/imximage.cfg
>> > @@ -70,7 +70,7 @@ DATA 4 0x020e05d0 0x00080000
>> >  DATA 4 0x021b001c 0x00008000
>> >  DATA 4 0x021b085c 0x1b4700c7
>> >  DATA 4 0x021b0800 0xa1390003
>> > -DATA 4 0x021b0890 0x00300000
>> > +DATA 4 0x021b0890 0x00400000
>> >  DATA 4 0x021b08b8 0x00000800
>> >  DATA 4 0x021b081c 0x33333333
>> >  DATA 4 0x021b0820 0x33333333
>> > @@ -92,7 +92,7 @@ DATA 4 0x021b0010 0x00100A82
>> >  DATA 4 0x021b0014 0x00000093
>> >  DATA 4 0x021b0018 0x00001688
>> >  DATA 4 0x021b002c 0x0f9f26d2
>> > -DATA 4 0x021b0030 0x0000020e
>> > +DATA 4 0x021b0030 0x009f0e10
>> >  DATA 4 0x021b0038 0x00190778
>> >  DATA 4 0x021b0008 0x00000000
>> >  DATA 4 0x021b0040 0x0000004f
>> 
>> Applied to u-boot-imx, thanks !
>
>OK.  But per 0/2 the SPL versions are out of sync and someone should
>take care of that :)
>
>-- 
>Tom



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  reply	other threads:[~2016-04-05  8:53 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-01 21:54 [U-Boot] [PATCH 0/2] i.MX6 LPDDR2 fixes Tom Rini
2016-04-01 21:54 ` [U-Boot] [PATCH 1/2] mx6qarm2: imximage_mx6dl.cfg update to fix tINIT3 violation Tom Rini
2016-04-03 17:22   ` Stefano Babic
2016-04-01 21:54 ` [U-Boot] [PATCH 2/2] mx6slevk: imximage.cfg: update to fix tINIT3 and tIH-CA violations Tom Rini
2016-04-01 23:58   ` Fabio Estevam
2016-04-03 17:22   ` Stefano Babic
2016-04-03 18:06     ` Tom Rini
2016-04-05  8:53       ` Peng Fan [this message]
2016-04-05 13:43         ` Tom Rini
2016-04-05 14:01           ` Stefano Babic
2016-04-06  4:45           ` Peng Fan

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