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From: "H. Peter Anvin" <hpa@zytor.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Conrad Kostecki <ck@conrad-kostecki.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"mingo@redhat.com" <mingo@redhat.com>
Subject: Re: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501
Date: Fri, 14 Feb 2014 10:39:40 -0800	[thread overview]
Message-ID: <a1204336-ad8d-4f2f-8078-24f043f123e6@email.android.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1402141924170.21991@ionos.tec.linutronix.de>

We could also just add an ACPI table... same concept.  Still need to find it.

On February 14, 2014 10:38:24 AM PST, Thomas Gleixner <tglx@linutronix.de> wrote:
>On Fri, 14 Feb 2014, H. Peter Anvin wrote:
>> On 02/14/2014 10:21 AM, Thomas Gleixner wrote:
>> > I wish we could just use devicetree for such cases and fix the crud
>> > ourself.
>> > 
>> 
>> We'd have to identify the platform, which is the main problem.  Right
>> now we support quirking for DMI or PCI, but I don't think we do for
>MPTABLE.
>
>My point is that device tree support for some basic stuff like
>hpet/ioapic and such would allow people like Conrad to avoid the
>stupid hackery of quirks.
>
>Building your own DT requires to read a datasheet as does hacking a
>quirk, but its definitely simpler. And we can collect the DTs for
>known boards either in the kernel or in some external repository.
>
>People who are dealing with embedded stuff are not those who are
>frightened by datasheets and building a custom kernel with some extra
>blob.
>
>I bet Conrad is also stuck with PIC on the E6xx CPU and that's a major
>PITA. I have such a board as well and it simply sucks.
>
>Now you can't hack an ioapic quirk because that's way to complex, but
>we have proven with the ce4100 that it is reasonably simple to get
>that stuff working nicely when you can read a datasheet. If we could
>generalize that for a few crucial devices that would help a lot.
>
>When I asked the board vendor why there are no acpi tables in the
>device, I got the answer, that this is an embedded board and the
>"BIOS" built with BLDK does not support that. We all know that's not
>true, but how does that help?
>
>The people who brought up the initial target OS (WinCE) on that board
>worked around the lack of ACPI by hacking HPET support into the CE
>preloader and switched all device drivers to use MSI because CE failed
>to handle the PIC properly. That avoided that they needed to hack the
>ioapic into submission as well.
>
>That's the sad reality. And we have to cope with these boards whether
>we like it or not.
>
>Thanks,
>
>	tglx

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.

  reply	other threads:[~2014-02-14 18:40 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-14 10:23 [PATCH] x86: HPET force enable for Soekris net6501 Conrad Kostecki
2014-02-14 17:46 ` H. Peter Anvin
2014-02-14 18:06   ` AW: " Conrad Kostecki
2014-02-14 18:08     ` H. Peter Anvin
2014-02-14 18:13       ` AW: " Conrad Kostecki
2014-02-14 18:16         ` H. Peter Anvin
2014-02-14 18:21           ` Thomas Gleixner
2014-02-14 18:22             ` H. Peter Anvin
2014-02-14 18:38               ` Thomas Gleixner
2014-02-14 18:39                 ` H. Peter Anvin [this message]
2014-02-14 19:15                   ` Thomas Gleixner
2014-02-14 19:26                     ` H. Peter Anvin
2014-02-14 19:59                       ` Thomas Gleixner
2014-02-14 20:06                         ` H. Peter Anvin
2014-02-14 21:16                           ` Thomas Gleixner
2014-02-14 21:18                             ` H. Peter Anvin
2014-02-14 21:47                               ` Thomas Gleixner
2014-02-14 21:48                                 ` H. Peter Anvin
2014-02-17 16:28                             ` Thomas Renninger
2014-02-17 17:19                               ` H. Peter Anvin
2014-02-17 18:23                                 ` Thomas Renninger
2014-02-17 18:47                                   ` H. Peter Anvin
2014-02-17 19:25                                     ` Thomas Renninger
2014-02-17 19:40                                       ` H. Peter Anvin
2014-02-18 18:22                                         ` ACPI: Also allow ACPI table adding via initrd not only overriding Thomas Renninger
2014-02-18 18:22                                           ` [PATCH 1/4] ACPI: Provide support for ACPI table adding via OS Thomas Renninger
2014-02-18 18:27                                             ` H. Peter Anvin
2014-02-18 18:44                                               ` Thomas Renninger
2014-02-18 20:51                                                 ` H. Peter Anvin
2014-02-19 11:22                                                   ` Thomas Renninger
2014-02-21  7:24                                                     ` [Devel] " Zheng, Lv
2014-02-21  7:28                                                 ` Zheng, Lv
2014-02-18 18:22                                           ` [PATCH 2/4] ACPICA: Introduce new acpi_os_physical_table_add OS callback Thomas Renninger
2014-02-18 18:22                                           ` [PATCH 3/4] ACPICA: Add BGRT signature to known signatures Thomas Renninger
2014-02-18 18:22                                           ` [PATCH 4/4] ACPI: Add new table signatures that can be overridden/added Thomas Renninger
2014-02-18 18:38                                           ` [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding Moore, Robert
2014-02-18 18:52                                             ` Thomas Renninger
2014-02-18 19:59                                               ` Moore, Robert
2014-02-19 11:14                                                 ` Thomas Renninger
2014-02-19 13:03                                                   ` Thomas Gleixner
2014-02-14 18:28           ` AW: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501 Conrad Kostecki
2014-09-09 13:56             ` Eric Sesterhenn
2014-09-09 14:54               ` Thomas Gleixner
2014-09-09 15:26                 ` H. Peter Anvin
2014-09-09 15:41                   ` Thomas Gleixner
2014-09-12  9:41                   ` Eric Sesterhenn
2014-09-12 10:37                     ` Thomas Gleixner
2014-09-12 11:06                       ` [PATCH] x86: HPET force enable for e6xx based systems Eric Sesterhenn
2014-09-16  0:58                         ` [tip:x86/platform] " tip-bot for Peter Neubauer

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