Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

From: Michal Simek
Date: Thu Feb 19 2015 - 07:46:53 EST

On 02/17/2015 08:17 PM, Pavel Machek wrote:
> On Tue 2015-02-17 11:07:53, Rob Landley wrote:
>> On 02/15/2015 04:40 PM, Pavel Machek wrote:
>>> On Wed 2015-01-21 13:27:00, Jason Gunthorpe wrote:
>>>> On Wed, Jan 21, 2015 at 06:33:12PM +0200, Pantelis Antoniou wrote:
>>>> My point is that the current firmware layer is overly cautious and
>>>> FPGAs are very big. My current project on small Xilinx device has a
>>>> 10MB programming file. The biggest Xilinx device today has a max
>>>> bitfile size around 122MB.
>>>> 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?
>> Unnecessarily pinning 10% of your ram is a good solution?
> Never said that. But I'd rather have _some_ API proposed, then try to
> design in everthing including kitchen sink and do nothing.

+1 on this.


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