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Date:   Tue, 1 Dec 2020 11:19:16 -0800
From:   Moritz Fischer <mdf@kernel.org>
To:     Richard Gong <richard.gong@linux.intel.com>
Cc:     Moritz Fischer <mdf@kernel.org>, gregkh@linuxfoundation.org,
        trix@redhat.com, linux-fpga@vger.kernel.org,
        linux-kernel@vger.kernel.org, dinguyen@kernel.org,
        sridhar.rajagopal@intel.com, richard.gong@intel.com
Subject: Re: [PATCHv2 1/5] firmware: stratix10-svc: add
 COMMAND_AUTHENTICATE_BITSTREAM flag
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Hi Richard,

On Tue, Dec 01, 2020 at 01:30:16PM -0600, Richard Gong wrote:

> > Can U-Boot determine whether it's the new or old flow? Can you set a
> > different compatible value in your device-tree, to disambiguate
> > behaviors?
> > 
> 
> The boot flow is determined by defconfig during compilation, which means
> each boot flow will have its own defconfig.
> 
> SDM firmware loads SPL into OCRAM, then SPL will load the apporiate ATF or
> U-boot into the DRAM according to the setting of CONFIG_SPL_ATF. If
> CONFIG_SPL_ATF=y, SPL loads ATF and then jumps to ATF. ATF setups EL3
> environment and initialize the PSCI services.
> 
> CONFIG_SPL_ATF is not set for the old boot flow.

So you know at (U-Boot) build time? Can you just pass a different DT to
the kernel in that case?

- Moritz