[U-Boot] [PATCH v8 4/7] arm: socfpga: Enable FPGA driver on SPL

Chee, Tien Fong
2017-06-07T11:26:21Z

On Rab, 2017-06-07 at 16:04 +0800, Chee, Tien Fong wrote:
> On Rab, 2017-06-07 at 08:36 +0200, Marek Vasut wrote:
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> > On 06/07/2017 05:06 AM, Chee, Tien Fong wrote:
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> > > On Sel, 2017-06-06 at 11:50 +0200, Marek Vasut wrote:
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> > > > On 06/06/2017 11:46 AM, Chee, Tien Fong wrote:
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> > > > > On Sel, 2017-06-06 at 11:41 +0200, Marek Vasut wrote:
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> > > > > > On 06/06/2017 11:36 AM, Chee, Tien Fong wrote:
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> > > > > > > On Sel, 2017-06-06 at 10:35 +0200, Marek Vasut wrote:
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> > > > > > > > On 06/06/2017 10:19 AM, Chee, Tien Fong wrote:
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> > > > > > > > > On Sel, 2017-06-06 at 10:03 +0200, Marek Vasut wrote:
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> > > > > > > > > > On 06/06/2017 08:35 AM, tien.fong.chee at intel.com
> > > > > > > > > > wrote:
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> > > > > > > > > > > From: Tien Fong Chee <tien.fong.chee@intel.com>
> > > > > > > > > > >
> > > > > > > > > > > This patch is for enabling FPGA driver support on
> > > > > > > > > > > SPL
> > > > > > > > > > Why would we want that on Gen5 ? I believe this is
> > > > > > > > > > only
> > > > > > > > > > needed on
> > > > > > > > > > Gen10.
> > > > > > > > > >
> > > > > > > > > I already moved the fpga_manager driver into
> > > > > > > > > drivers/fpga/
> > > > > > > > > on
> > > > > > > > > patch
> > > > > > > > > 6,
> > > > > > > > > and fpga_manager drivers are required on SPL.
> > > > > > > > > Actually
> > > > > > > > > fpga_manager
> > > > > > > > > driver should be part of the drivers/fpga.
> > > > > > > > I think I miss some fundamental piece of information .
> > > > > > > > Why
> > > > > > > > would
> > > > > > > > I
> > > > > > > > need
> > > > > > > > anything from the FPGA framework in SPL on Gen5 ? It is
> > > > > > > > not
> > > > > > > > needed
> > > > > > > > thus
> > > > > > > > far. Is it because you shuffled some of the code around
> > > > > > > > or
> > > > > > > > what ?
> > > > > > > >
> > > > > > > Because we need to know some status and mode type from
> > > > > > > FPGA
> > > > > > > even we
> > > > > > > did
> > > > > > > not program FPGA in SPL.
> > > > > > But we didn't have this option enabled before and
> > > > > > everything
> > > > > > worked
> > > > > > on
> > > > > > gen5, why do we need it now ?
> > > > > >
> > > > > Because i already move them into fpga driver, because those
> > > > > functions
> > > > > should be part of fpga driver. So, this moving happen in
> > > > > patch
> > > > > 6.
> > > > I see. Does enabling the FPGA_SPL stuff pull in any of the FPGA
> > > > framework ? Does the size of the Gen5 SPL change before and
> > > > after
> > > > this
> > > > patchset ? If you did not check, please do.
> > > Yeah, i confirm FPGA driver is availabled in SPL. A bit change in
> > > size,
> > > 1~2K more. I did the test on our devkits also.
> > OK, so that's not acceptable because we're already very close to
> > the
> > size limit of the SPL.
> >
> Any safety guideline?
> I checked the spl.map, we still have 10K left after calculation
> including bss size.
>
I compiled all Intel fpga related defconfigs, and we have 9K free based
on total 64K memory size. SO building PFGA driver would contribute
around 1~2K only to SPL size. Do you have concern with that?

If you have concern, i would remove patch 6, keep fpga_manager intact.

> Thanks.