linux-kernel - Re: [PATCH] powerpc: Add support for early debugging via Serial 16550 console

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Message-ID: <20220822152852.y5fjpmjjasbu2wab@pali>
Date:   Mon, 22 Aug 2022 17:28:52 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Nick Child <nick.child@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] powerpc: Add support for early debugging via Serial
 16550 console

On Monday 22 August 2022 14:13:30 Christophe Leroy wrote:
> >> CONFIG_PPC_EARLY_DEBUG_16550=y
> >> # CONFIG_PPC_EARLY_DEBUG_MEMCONS is not set
> >> CONFIG_PPC_EARLY_DEBUG_16550_PHYSADDR=
> >> CONFIG_PPC_EARLY_DEBUG_16550_STRIDE=1
> >>
> >> which then causes a kconfig prompt when starting
> >> the build...
> > 
> > Cannot we set somehow that PPC_EARLY_DEBUG_16550 would be disabled by
> > default when upgrading defconfig?
> 
> The only solution I see is to put it at the end of the list, so that the 
> previous default value which is PPC_EARLY_DEBUG_MEMCONS gets selected.

Does it work for all cases? If yes, then it looks like an elegant solution.