Re: [RFC/PATCH 0/4] request_firmware() on memory constrained devices

From	Stephen Boyd <stephen.boyd@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [RFC/PATCH 0/4] request_firmware() on memory constrained devices
Date	2016-03-08 11:10 +0100
Message-ID	<ramKv-7SB-29@gated-at.bofh.it> (permalink)
References	<ram7L-7oJ-5@gated-at.bofh.it> <ramht-7tc-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Quoting Alexander Stein (2016-03-08 16:32:21)
> On Tuesday 08 March 2016 16:22:15, Stephen Boyd wrote:
> > Some systems are memory constrained but they need to load very
> > large firmwares. 
> 
> Out of curiousity, about which sizes of memory and firmware are you talking about?
> 

Hm.. I've seen an extreme case where there's around 100MB of a 128MB DDR
part dedicated to non-Linux firmware. So attempting to load that
firmware into DDR just doesn't work at all unless you have this patch
series. This is the most extreme case I've seen though.

Please also note that this is also about skipping the memcpy() step,
which I should probably quantify how much that actually matters if at
all. I'll make sure to do some loading time measurements in the next
round.

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[RFC/PATCH 0/4] request_firmware() on memory constrained devices Stephen Boyd <stephen.boyd@linaro.org> - 2016-03-08 10:30 +0100
  [RFC/PATCH 4/4] firmware: Support requesting firmware directly into DMA memory Stephen Boyd <stephen.boyd@linaro.org> - 2016-03-08 10:30 +0100
    Re: [RFC/PATCH 4/4] firmware: Support requesting firmware directly  into DMA memory Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 13:10 +0100
    Re: [RFC/PATCH 4/4] firmware: Support requesting firmware directly  into DMA memory Ming Lei <tom.leiming@gmail.com> - 2016-03-08 14:50 +0100
      Re: [RFC/PATCH 4/4] firmware: Support requesting firmware directly  into DMA memory Mark Brown <broonie@kernel.org> - 2016-03-09 03:30 +0100
  [PATCH 1/4] ARM64: dma: Add support for NO_KERNEL_MAPPING attribute Stephen Boyd <stephen.boyd@linaro.org> - 2016-03-08 10:30 +0100
    Re: [PATCH 1/4] ARM64: dma: Add support for NO_KERNEL_MAPPING  attribute Robin Murphy <robin.murphy@arm.com> - 2016-03-08 15:00 +0100
  [RFC/PATCH 2/4] dma-mapping: Add dma_remap() APIs Stephen Boyd <stephen.boyd@linaro.org> - 2016-03-08 10:30 +0100
  [RFC/PATCH 3/4] firmware_class: Provide infrastructure to make fw caching optional Stephen Boyd <stephen.boyd@linaro.org> - 2016-03-08 10:30 +0100
  Re: [RFC/PATCH 0/4] request_firmware() on memory constrained devices Alexander Stein <alexander.stein@systec-electronic.com> - 2016-03-08 10:40 +0100
    Re: [RFC/PATCH 0/4] request_firmware() on memory constrained devices Stephen Boyd <stephen.boyd@linaro.org> - 2016-03-08 11:10 +0100

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