From: Lee Jones <lee.jones@linaro.org>
To: "cym@rock-chips.com" <cym@rock-chips.com>
Cc: u-boot <u-boot@lists.denx.de>,
linux-rockchip <linux-rockchip@lists.infradead.org>,
wxt <wxt@rock-chips.com>, 杨凯 <kever.yang@rock-chips.com>,
zhangqing <zhangqing@rock-chips.com>,
黄小东 <derrick.huang@rock-chips.com>, 陈健洪 <chenjh@rock-chips.com>,
林平 <hisping.lin@rock-chips.com>, 汤云平 <typ@rock-chips.com>,
cwz <cwz@rock-chips.com>, chenfen <chenfen@rock-chips.com>,
jagan <jagan@amarulasolutions.com>, sjg <sjg@chromium.org>,
pgwipeout <pgwipeout@gmail.com>, adelva <adelva@google.com>,
rammuthiah <rammuthiah@google.com>
Subject: Re: Re: [Rock Pi 4+] Mainline LPDDR4 RAM initialisation is not sufficient to boot successfully
Date: Fri, 17 Jun 2022 17:50:43 +0100 [thread overview]
Message-ID: <Yqyw4wFl46U+C51p@google.com> (raw)
In-Reply-To: <2022061720060297899624@rock-chips.com>
On Fri, 17 Jun 2022, cym@rock-chips.com wrote:
> Could you help us to get the DRAM part number which initialization failures on the Rock Pi 4+.
I have tested 3 boards; one appears to be fully working, on another 1
of the 2 LPDDR4 (Channel 1) chips consistently fails with a Col and
Cap Error and on the final one both chips (Channel 0 & 1) fail in the
same way as the last (Col and Cap errors).
All chips are: H9HCNNNBKUML
> We have found that some LPDDR4 abnormal operation at 50MHz.
> I think you can try that use 400MHz to detect capacity.
Wonderful. This solves the problem. Thank you so much!
Would you like to submit this into upstream U-boot yourself, or would
you like me to do that for you?
If the former, please Cc me on the patch and add my:
Tested-by Lee Jones <lee.jones@linaro.org>
If the latter, please let me know and I'll do what I can to help.
--
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
prev parent reply other threads:[~2022-06-17 16:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-25 13:32 [Rock Pi 4+] Mainline LPDDR4 RAM initialisation is not sufficient to boot successfully Lee Jones
2022-06-16 19:15 ` Lee Jones
2022-06-17 12:06 ` cym
2022-06-17 16:50 ` Lee Jones [this message]
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