From: Kever Yang <kever.yang@rock-chips.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 0/3] Add sdram capacity auto detect for rk3288
Date: Thu, 22 Sep 2016 10:15:47 +0800 [thread overview]
Message-ID: <57E33ED3.3000901@rock-chips.com> (raw)
In-Reply-To: <CABCGj3ZoirHY+32W=agOmU=tSkX_v+0DMeL3frSmLW7sq2KYfA@mail.gmail.com>
Hi Sandy,
On 09/21/2016 08:41 PM, Sandy Patterson wrote:
>
> On Tue, Sep 20, 2016 at 10:56 PM, Kever Yang
> <kever.yang at rock-chips.com <mailto:kever.yang@rock-chips.com>> wrote:
>
> parameters changes from dts to auto-detect including those I
> removed from dts and ddrconfig, stride, they should be the same as
> without my patch, which means my patch suppose to not change any
> parameter for DDR other than how we get those parameters.
>
> EARLY_DEBUG was the right idea. Only for some reason it's called
> EARLY_UART on rk3288.
>
> I tested rock2 and it is getting dbw parameter of 2 instead of 1 for
> with the unmodified code for both channels. I'm afraid I do not know
> the significance of this and don't have a good way to test for
> stability. I am using rock2 square model a with 2gb ram.
>
For LPDDR3, the die bit width(dbw) is fix 2(32bits); and for DDR3 it
might be dbw=1(16bit, more likely) or dbw=0(8bit), this parameter only
affect the DRAM tRFC, won't affect the stability but maybe very little
performance difference if we use smaller die bitwidth.
Thanks,
- Kever
> Sandy
prev parent reply other threads:[~2016-09-22 2:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 3:28 [U-Boot] [PATCH v2 0/3] Add sdram capacity auto detect for rk3288 Kever Yang
2016-09-20 3:28 ` [U-Boot] [PATCH v2 1/3] rk3288: config change for enable dram capacity auto-detect Kever Yang
2016-09-20 13:21 ` Sandy Patterson
2016-09-21 3:00 ` Kever Yang
2016-09-21 11:53 ` Sandy Patterson
2016-09-22 2:10 ` Kever Yang
2016-09-20 3:28 ` [U-Boot] [PATCH v2 2/3] rk3288: sdram: auto-detect the capacity Kever Yang
2016-09-23 2:53 ` Simon Glass
2016-10-07 9:14 ` Kever Yang
2016-10-06 0:28 ` Vagrant Cascadian
2016-09-20 3:28 ` [U-Boot] [PATCH v2 3/3] dts: rk3288: remove node in dmc which not need anymore Kever Yang
2016-09-23 2:58 ` Simon Glass
2016-10-06 0:28 ` Vagrant Cascadian
2016-09-20 15:04 ` [U-Boot] [PATCH v2 0/3] Add sdram capacity auto detect for rk3288 Sandy Patterson
2016-09-21 2:56 ` Kever Yang
2016-09-21 12:41 ` Sandy Patterson
2016-09-22 2:15 ` Kever Yang [this message]
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