From: Wolfram Sang <wsa@the-dreams.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] [RFC] ARM: shmobile: Add early debugging support using SCIF(A)
Date: Mon, 06 Oct 2014 09:01:50 +0000 [thread overview]
Message-ID: <20141006090149.GC1266@katana> (raw)
In-Reply-To: <CAMuHMdXRcuq+hcyjeRDgFqKo2n7JSR5tTfz6wstTXnm2ohKdtQ@mail.gmail.com>
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> I agree with your statement about using the same wires.
> However, having the ability to pinmux both SCIF0 and SCIFA0 to the same
> wires is not a board property, but an SoC property, right?
Both. The SoC needs to support muxing them to the same wires, yes. But
the board must also support it. E.g. SCIFA0 could already be used using
some other wires, then it is not possible anymore.
> Nevertheless, for DEBUG_LL, this is early debug output, so it should use the
> exact same settings as the bootloader, which has configured SCIF0, and
> (b) has setup pinmux for SCIF0.
True.
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From: wsa@the-dreams.de (Wolfram Sang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] [RFC] ARM: shmobile: Add early debugging support using SCIF(A)
Date: Mon, 6 Oct 2014 11:01:50 +0200 [thread overview]
Message-ID: <20141006090149.GC1266@katana> (raw)
In-Reply-To: <CAMuHMdXRcuq+hcyjeRDgFqKo2n7JSR5tTfz6wstTXnm2ohKdtQ@mail.gmail.com>
> I agree with your statement about using the same wires.
> However, having the ability to pinmux both SCIF0 and SCIFA0 to the same
> wires is not a board property, but an SoC property, right?
Both. The SoC needs to support muxing them to the same wires, yes. But
the board must also support it. E.g. SCIFA0 could already be used using
some other wires, then it is not possible anymore.
> Nevertheless, for DEBUG_LL, this is early debug output, so it should use the
> exact same settings as the bootloader, which has configured SCIF0, and
> (b) has setup pinmux for SCIF0.
True.
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next prev parent reply other threads:[~2014-10-06 9:01 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-02 19:02 [PATCH] [RFC] ARM: shmobile: Add early debugging support using SCIF(A) Geert Uytterhoeven
2014-10-02 19:02 ` Geert Uytterhoeven
2014-10-03 0:04 ` Khiem Nguyen
2014-10-03 0:04 ` Khiem Nguyen
2014-10-03 7:21 ` Geert Uytterhoeven
2014-10-03 7:21 ` Geert Uytterhoeven
2014-10-03 10:19 ` Khiem Nguyen
2014-10-03 10:19 ` Khiem Nguyen
2014-10-03 11:28 ` Geert Uytterhoeven
2014-10-03 11:28 ` Geert Uytterhoeven
2014-10-05 22:18 ` Laurent Pinchart
2014-10-05 22:18 ` Laurent Pinchart
2014-10-06 6:03 ` Wolfram Sang
2014-10-06 6:03 ` Wolfram Sang
2014-10-06 6:14 ` Magnus Damm
2014-10-06 6:14 ` Magnus Damm
2014-10-06 8:56 ` Geert Uytterhoeven
2014-10-06 8:56 ` Geert Uytterhoeven
2014-10-06 9:01 ` Wolfram Sang [this message]
2014-10-06 9:01 ` Wolfram Sang
2014-10-06 9:08 ` Geert Uytterhoeven
2014-10-06 9:08 ` Geert Uytterhoeven
2014-10-07 10:37 ` Ian Molton
2014-10-07 10:37 ` Ian Molton
2014-10-07 11:07 ` Geert Uytterhoeven
2014-10-07 11:07 ` Geert Uytterhoeven
2014-10-07 12:39 ` Geert Uytterhoeven
2014-10-07 12:39 ` Geert Uytterhoeven
2014-10-05 23:36 ` Magnus Damm
2014-10-05 23:36 ` Magnus Damm
2014-10-06 9:18 ` Geert Uytterhoeven
2014-10-06 9:18 ` Geert Uytterhoeven
2014-10-07 10:49 ` Arnd Bergmann
2014-10-07 10:49 ` Arnd Bergmann
2014-10-07 11:46 ` Geert Uytterhoeven
2014-10-07 11:46 ` Geert Uytterhoeven
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