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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Calvin Johnson <calvin.johnson@oss.nxp.com>,
	Grant Likely <grant.likely@arm.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Jeremy Linton <jeremy.linton@arm.com>,
	Russell King - ARM Linux admin <linux@armlinux.org.uk>,
	Jon <jon@solid-run.com>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Madalin Bucur <madalin.bucur@oss.nxp.com>,
	netdev <netdev@vger.kernel.org>, "linux.cj" <linux.cj@gmail.com>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	nd <nd@arm.com>
Subject: Re: [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY
Date: Tue, 29 Sep 2020 17:46:53 +0300
Message-ID: <CAHp75VfjOBDpuY_df1wdxUUfFQV_t_k2PjrwHjd0dvE3jojZ=w@mail.gmail.com> (raw)
In-Reply-To: <20200929143239.GI3950513@lunn.ch>

On Tue, Sep 29, 2020 at 5:32 PM Andrew Lunn <andrew@lunn.ch> wrote:
>
> On Tue, Sep 29, 2020 at 04:55:40PM +0300, Andy Shevchenko wrote:
> > On Tue, Sep 29, 2020 at 4:43 PM Andrew Lunn <andrew@lunn.ch> wrote:
> > > On Tue, Sep 29, 2020 at 10:47:03AM +0530, Calvin Johnson wrote:
> > > > On Fri, Sep 25, 2020 at 02:34:21PM +0100, Grant Likely wrote:
> >
> > ...
> >
> > > Newbie ACPI question: Does ACPI even support big endian CPUs, given
> > > its x86 origins?
> >
> > I understand the newbie part, but can you elaborate what did you mean
> > under 'support'?
> > To me it sounds like 'network stack was developed for BE CPUs, does it
> > support LE ones?'
>
> Does ACPI define the endianness of its tables? Is it written in the
> standard that they should be little endian?

5.2:
"All numeric values in ACPI-defined tables, blocks, and structures are
always encoded in little endian
format. Signature values are stored as fixed-length strings."

>  Does Tianocore, or any
> other implementations, have the needed le32_to_cpu() calls so that
> they can boot on a big endian CPU?

Not of my knowledge.

> Does it have a standardized way of
> saying a device is big endian, swap words around if appropriate when
> doing IO?

I guess this is not applicable to ACPI. Does Linux have a standardized way?
So, what did you mean under doing I/O? I mean in which context?

> Is it feasible to boot an ARM system big endian?

Not an ARM guy.

> Can i boot the same
> system little endian? The CPU should be able to do it, but are the
> needed things in the ACPI specification and implementation to allow
> it?

-- 
With Best Regards,
Andy Shevchenko

  reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  9:03 [net-next PATCH v7 0/6] ACPI support for dpaa2 MAC driver Calvin Johnson
2020-07-15  9:03 ` [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson
2020-07-16  3:04   ` Florian Fainelli
2020-07-16  3:11     ` Andrew Lunn
2020-07-23 23:26   ` Jeremy Linton
2020-07-24 13:39     ` Andrew Lunn
2020-07-24 17:26       ` Jeremy Linton
2020-07-24 17:39         ` Florian Fainelli
2020-07-24 19:20           ` Andrew Lunn
2020-07-24 20:12             ` Andy Shevchenko
2020-07-24 20:13               ` Florian Fainelli
2020-07-24 20:20                 ` Andy Shevchenko
2020-07-25  7:36                   ` Calvin Johnson
2020-07-25 10:48                     ` Andy Shevchenko
2020-07-24 21:06               ` Russell King - ARM Linux admin
2020-07-27 17:03             ` Sudeep Holla
2020-07-24 19:14         ` Andrew Lunn
2020-07-27 17:21           ` Sudeep Holla
2020-07-28 20:34             ` Andrew Lunn
2020-07-28 20:59               ` Russell King - ARM Linux admin
2020-07-28 21:26                 ` Andy Shevchenko
2020-07-29 16:00               ` Rafael J. Wysocki
2020-07-31 15:08                 ` Andrew Lunn
2020-07-27 17:32           ` Jon Nettleton
     [not found]           ` <1595922651-sup-5323@galangal.danc.bne.opengear.com>
2020-07-28 20:45             ` Andrew Lunn
2020-07-28 20:56               ` Florian Fainelli
2020-07-28 21:28                 ` Andy Shevchenko
2020-07-28 21:40                   ` Florian Fainelli
2020-07-31 15:14                   ` Andrew Lunn
2020-09-25 13:22                     ` Grant Likely
2020-07-28 22:30             ` Jeremy Linton
2020-07-29  0:39               ` Florian Fainelli
2020-07-29  2:53                 ` Jeremy Linton
2020-07-29  3:16                   ` Florian Fainelli
2020-07-29  8:43                   ` Jon Nettleton
2020-07-29  9:39                     ` Calvin Johnson
2020-09-25 13:34   ` Grant Likely
2020-09-26  4:30     ` Calvin Johnson
2020-09-29  5:17     ` Calvin Johnson
2020-09-29 13:43       ` Andrew Lunn
2020-09-29 13:55         ` Andy Shevchenko
2020-09-29 14:32           ` Andrew Lunn
2020-09-29 14:46             ` Andy Shevchenko [this message]
2020-09-29 15:06               ` Andrew Lunn
2020-09-29 15:29               ` Arnd Bergmann
2020-09-29 14:44         ` Arnd Bergmann
2020-09-29 14:59           ` Andrew Lunn
2020-09-29 15:59             ` Grant Likely
2020-09-29 15:53         ` Grant Likely
2020-09-29 16:04           ` Calvin Johnson
2020-07-15  9:03 ` [net-next PATCH v7 2/6] net: phy: introduce device_mdiobus_register() Calvin Johnson
2020-07-16  3:05   ` Florian Fainelli
2020-07-15  9:03 ` [net-next PATCH v7 3/6] net/fsl: use device_mdiobus_register() Calvin Johnson
2020-07-16  3:05   ` Florian Fainelli
2020-07-15  9:03 ` [net-next PATCH v7 4/6] net: phy: introduce phy_find_by_mdio_handle() Calvin Johnson
2020-07-16  3:06   ` Florian Fainelli
2020-07-15  9:03 ` [net-next PATCH v7 5/6] phylink: introduce phylink_fwnode_phy_connect() Calvin Johnson
2020-07-15  9:04 ` [net-next PATCH v7 6/6] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver Calvin Johnson
2020-09-25 13:39 ` [net-next PATCH v7 0/6] ACPI support for dpaa2 " Grant Likely
2020-09-26  4:34   ` Calvin Johnson
2020-07-25 14:23 Calvin Johnson
2020-07-25 14:23 ` [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson

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