From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Pavel Machek <pavel@denx.de>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
atull <atull@opensource.altera.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
hpa@zytor.com, Michal Simek <monstr@monstr.eu>,
Michal Simek <michal.simek@xilinx.com>,
Randy Dunlap <rdunlap@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
devicetree@vger.kernel.org, robh+dt@kernel.org,
Grant Likely <grant.likely@linaro.org>,
iws@ovro.caltech.edu, linux-doc@vger.kernel.org,
Mark Brown <broonie@kernel.org>,
philip@balister.org, rubini@gnudd.com,
Steffen Trumtrar <s.trumtrar@pengutronix.de>,
jason@lakedaemon.net, kyle.teske@ni.com, nico@linaro.org,
Felipe Balbi <balbi@ti.com>,
m.chehab@samsung.com, davidb@codeaurora.org,
Rob Landley <rob@landley.net>,
davem@davemloft.net, cesarb@cesarb.net, sameo@linux.intel.com,
Andrew Morton <akpm@linux->
Subject: Re: [PATCH v8 2/4] fpga manager: add sysfs interface document
Date: Tue, 17 Feb 2015 11:12:19 -0700 [thread overview]
Message-ID: <20150217181219.GA27658@obsidianresearch.com> (raw)
In-Reply-To: <20150215224006.GA5626@amd>
On Sun, Feb 15, 2015 at 11:40:06PM +0100, Pavel Machek wrote:
> > So keeping that much memory pinned in the kernel when I can prove it
> > is uncessary for my system (either because there is no suspend/resume
> > possibility, or because I know the CPU can always access the
> > filesytem) is very undesirable.
>
> Well, your current device aalso has 1GB RAM, no?
No, certainly not. 256MB - the board only has space for two x16 DDR3
chips, and at design time 1GBit was about the biggest that could be
reasonably obtained.
It is also using a Zynq chip for management and the next firmware spin
is likely to throw away 50% of that space to enable Xilinx's narrow ECC
scheme on the ram.
The Linux environment requires only about 40M of ram for runtime, as
it was designed for systems with only 64M of ram, so even the 128M is
overkill.
Jason
next prev parent reply other threads:[~2015-02-17 18:12 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-06 20:13 [PATCH v8 0/4] FPGA Manager Framework atull
2015-01-06 20:13 ` [PATCH v8 1/4] doc: add bindings document for altera fpga manager atull
2015-01-06 22:05 ` Rob Herring
2015-01-06 22:34 ` atull
2015-01-09 15:50 ` Rob Herring
[not found] ` <CAL_Jsq+pn5MW6veUivEL49FLSQxZOWRq0gU9Q6iD5jzurKK3rQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-09 18:58 ` atull
2015-01-06 20:13 ` [PATCH v8 2/4] fpga manager: add sysfs interface document atull
2015-01-07 8:48 ` Pavel Machek
2015-01-09 19:14 ` atull
2015-01-09 20:56 ` Pavel Machek
2015-01-10 8:10 ` Pantelis Antoniou
2015-01-10 15:11 ` Pavel Machek
2015-01-11 16:29 ` atull
2015-01-12 8:45 ` Pavel Machek
2015-01-12 13:48 ` Michal Simek
2015-01-13 7:28 ` Pavel Machek
2015-01-13 7:40 ` Pantelis Antoniou
2015-01-13 7:56 ` Pavel Machek
2015-01-13 17:27 ` atull
2015-01-12 16:05 ` Rob Herring
2015-01-12 16:26 ` Mark Brown
2015-01-12 18:06 ` Jason Gunthorpe
2015-01-13 16:21 ` One Thousand Gnomes
2015-01-15 21:52 ` Pavel Machek
2015-01-12 21:01 ` One Thousand Gnomes
2015-01-12 21:43 ` Jason Gunthorpe
2015-01-13 16:28 ` One Thousand Gnomes
2015-01-13 17:26 ` Pantelis Antoniou
2015-01-13 19:44 ` atull
2015-01-14 15:58 ` One Thousand Gnomes
2015-01-13 20:00 ` Jason Gunthorpe
2015-01-13 21:37 ` atull
2015-01-13 22:24 ` Jason Gunthorpe
2015-01-14 16:06 ` One Thousand Gnomes
2015-01-14 18:12 ` Jason Gunthorpe
2015-01-14 19:01 ` Pantelis Antoniou
2015-01-15 11:36 ` One Thousand Gnomes
2015-01-15 11:44 ` Mark Brown
2015-01-15 16:34 ` atull
2015-01-15 18:47 ` Jason Gunthorpe
2015-01-15 20:45 ` One Thousand Gnomes
2015-01-15 20:54 ` Pantelis Antoniou
2015-01-21 16:01 ` One Thousand Gnomes
[not found] ` <20150121160151.453ba403-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
2015-01-21 16:33 ` Pantelis Antoniou
[not found] ` <D466D9FF-25DA-4765-9469-128733BEBC4D-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>
2015-01-21 20:27 ` Jason Gunthorpe
2015-01-21 20:32 ` Pantelis Antoniou
2015-02-15 22:40 ` Pavel Machek
2015-02-17 17:07 ` Rob Landley
2015-02-17 19:17 ` Pavel Machek
2015-02-19 12:46 ` Michal Simek
2015-02-21 6:31 ` atull
2015-02-17 18:12 ` Jason Gunthorpe [this message]
2015-01-15 21:42 ` Jason Gunthorpe
2015-01-17 21:11 ` Pavel Machek
2015-01-06 20:13 ` [PATCH v8 3/4] staging: fpga manager: framework core atull
2015-01-06 20:13 ` [PATCH v8 4/4] staging: fpga manager: add driver for socfpga fpga manager atull
2015-01-10 18:11 ` [PATCH v8 0/4] FPGA Manager Framework Konrad Zapalowicz
2015-01-11 16:08 ` atull
2015-01-11 16:24 ` Konrad Zapalowicz
2015-01-11 19:52 ` Pavel Machek
2015-01-11 20:58 ` Konrad Zapalowicz
2015-01-11 21:31 ` Pavel Machek
2015-01-12 13:50 ` Michal Simek
2015-01-12 14:06 ` Dan Carpenter
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