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From: Ryan Chen <ryan_chen@aspeedtech.com>
To: Zev Weiss <zev@bewilderbeest.net>
Subject: RE: [PATCH u-boot v2019.04-aspeed-openbmc v2] aspeed: add
 CONFIG_ASPEED_ENABLE_BACKDOORS
Thread-Topic: [PATCH u-boot v2019.04-aspeed-openbmc v2] aspeed: add
 CONFIG_ASPEED_ENABLE_BACKDOORS
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Date: Tue, 19 Apr 2022 02:32:56 +0000
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 <openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org>

Hello,
	Yes, leave SCU70[20] =3D0, set HICR5[8] =3D 0, HICRB[6] =3D 1 is enough to=
 disable LPC2AHB.
	HICR5[6] is LPC fw cycle it is allowed.

Ryan

> -----Original Message-----
> From: Zev Weiss <zev@bewilderbeest.net>
> Sent: Tuesday, April 19, 2022 9:00 AM
> To: Ryan Chen <ryan_chen@aspeedtech.com>
> Cc: Joel Stanley <joel@jms.id.au>; openbmc@lists.ozlabs.org; Andrew Jeffe=
ry
> <andrew@aj.id.au>; Ian Woloschin <ian.woloschin@akamai.com>
> Subject: Re: [PATCH u-boot v2019.04-aspeed-openbmc v2] aspeed: add
> CONFIG_ASPEED_ENABLE_BACKDOORS
>=20
> On Fri, Apr 15, 2022 at 01:11:09AM PDT, Ryan Chen wrote:
> >Hello,
> >	Thanks your response.
> >	And yes, I prefer apply patch without any config to disable it.
> >
> >Ryan
> >
>=20
> After thinking about this a bit more, I remembered that Ian Woloschin
> (CCed) had mentioned at some point that the systems he works with do in f=
act
> use the AST2500's built-in Super-IO, and hence would presumably be broken=
 by
> a patch that unconditionally disabled that.  And in contrast, the ASRock =
boards
> I've been working with require the AST2500 Super-IO to be disabled for th=
e
> host to boot properly, so it seems like we'll need
> *some* minimal amount of configurability to support at least those two
> classes of systems (i.e. a Kconfig boolean that determines whether the
> Super-IO should be enabled or disabled).
>=20
> I don't know offhand what the interactions between SCU70[20], HICRB[6], a=
nd
> HICR5[10] are though, and I don't have any hardware that actually uses th=
e
> AST2500 Super-IO to test with.  Would leaving SCU70[20]=3D0 to enable the
> Super-IO while leaving HICRB[6]=3D1 and HICR5[10]=3D0 work for systems li=
ke
> Ian's to enable the Super-IO while keeping everything else locked down as
> much as possible?
>=20
>=20
> Zev