port prpmc610
siman
siman at bsysjob.sharella.com
Thu Dec 22 14:29:51 EST 2005
Hi All:
I am porting linux to the prpmc610 board, powerpc610 has the ppc5debug
system, I have tried more deconfigs,but failed, The system can not run the
kernel When I execute the kernel, Anybody have any experience to port this
system. Please tell me.
Thank you so much.
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发送时间: 2005年12月22日 9:00
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主题: Linuxppc-embedded Digest, Vol 16, Issue 55
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When replying, please edit your Subject line so it is more specific than
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Today's Topics:
1. Re: [RFC] RTC subsystem (Simon Richter)
2. Re: [RFC] RTC subsystem (Alessandro Zummo)
3. Re: [RFC] RTC subsystem (Simon Richter)
4. [RFC] genalloc != generic DEVICE memory allocator (Andrey Volkov)
5. Re: [RFC] RTC subsystem (Alessandro Zummo)
6. Re: [RFC] RTC subsystem (Simon Richter)
----------------------------------------------------------------------
Message: 1
Date: Wed, 21 Dec 2005 13:18:25 +0100
From: Simon Richter <Simon.Richter at hogyros.de>
Subject: Re: [RFC] RTC subsystem
To: Alessandro Zummo <azummo-lists at towertech.it>
Cc: linuxppc-dev at ozlabs.org, linuxppc-embedded at ozlabs.org,
lm-sensors at lm-sensors.org, linux-arm-kernel at lists.arm.linux.org.uk,
nslu2-developers at yahoogroups.com
Message-ID: <43A94811.4010704 at hogyros.de>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
Alessandro Zummo wrote:
> I've posted a proposal for a new RTC subsystem on lkml (
> http://lkml.org/lkml/2005/12/20/220 ) .
I agree that there is room for improvement. Do you have a specific structure
in mind? Specifically,
- which functions do you believe to be generic,
- how should multiple RTCs be handled,
- are read-only (radio controlled) RTCs taken care of?
At present, I don't have time to help the cause, but I can provide hosting
for a git tree if desired.
Simon
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Message: 2
Date: Wed, 21 Dec 2005 16:07:12 +0100
From: Alessandro Zummo <azummo-lists at towertech.it>
Subject: Re: [RFC] RTC subsystem
To: Simon Richter <Simon.Richter at hogyros.de>
Cc: linuxppc-dev at ozlabs.org, linuxppc-embedded at ozlabs.org,
lm-sensors at lm-sensors.org, linux-arm-kernel at lists.arm.linux.org.uk,
nslu2-developers at yahoogroups.com
Message-ID: <20051221160712.2d322f42 at inspiron>
Content-Type: text/plain; charset=US-ASCII
On Wed, 21 Dec 2005 13:18:25 +0100
Simon Richter <Simon.Richter at hogyros.de> wrote:
> > I've posted a proposal for a new RTC subsystem on lkml (
> > http://lkml.org/lkml/2005/12/20/220 ) .
>
> I agree that there is room for improvement. Do you have a specific
> structure in mind? Specifically,
Hi Simon,
the proposal actually had a fully-working patch attached :)
> - which functions do you believe to be generic,
> - how should multiple RTCs be handled,
In my code, the first rtc that register is bound to /proc/driver/rtc and
/dev/rtc (if those interfaces are compiled in, as they are all selectable).
The other RTCs are available thru /sys/class/rtc/rtcX (again, if compiled
in).
> - are read-only (radio controlled) RTCs taken care of?
You have full control of which functions you will provide to the upper
layer. Obivously if you try to set the time on a read-only rtc, you will
get an error.
> At present, I don't have time to help the cause, but I can provide
> hosting for a git tree if desired.
Thanks, I'll consider it if the need arises.
--
Best regards,
Alessandro Zummo,
Tower Technologies - Turin, Italy
http://www.towertech.it
------------------------------
Message: 3
Date: Wed, 21 Dec 2005 17:02:55 +0100
From: Simon Richter <Simon.Richter at hogyros.de>
Subject: Re: [RFC] RTC subsystem
To: Alessandro Zummo <azummo-lists at towertech.it>
Cc: linuxppc-dev at ozlabs.org, lm-sensors at lm-sensors.org,
linuxppc-embedded at ozlabs.org
Message-ID: <43A97CAF.50301 at hogyros.de>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
Alessandro Zummo wrote:
> the proposal actually had a fully-working patch attached :)
Ah, didn't see that, as I just skimmed over the web archive page you linked
to, which has no link to the actual patch (or I'm too stupid to find it).
> In my code, the first rtc that register is bound to /proc/driver/rtc
> and /dev/rtc (if those interfaces are compiled in, as they are all
> selectable).
It would be good to have a way to change which clock is the "primary"
one from userspace later (userspace because this is clearly site policy).
> You have full control of which functions you will provide to the
> upper layer. Obivously if you try to set the time on a read-only rtc,
> you will get an error.
Sure. I was thinking of the question which error that should be.
Simon
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Message: 4
Date: Wed, 21 Dec 2005 20:23:28 +0300
From: Andrey Volkov <avolkov at varma-el.com>
Subject: [RFC] genalloc != generic DEVICE memory allocator
To: jes at trained-monkey.org
Cc: Andrew Morton <akpm at osdl.org>, linux-kernel at vger.kernel.org,
linuxppc-embedded at ozlabs.org
Message-ID: <43A98F90.9010001 at varma-el.com>
Content-Type: text/plain; charset=KOI8-R
Hello Jes and all
I try to use your allocator (gen_pool_xxx), idea of which is a cute nice
thing. But current implementation of it is inappropriate for a _device_ (aka
onchip, like framebuffer) memory allocation, by next reasons:
1) Device memory is expensive resource by access time and/or size cost.
So we couldn't use (usually) this memory for the free blocks lists.
2) Device memory usually have special requirement of access to it
(alignment/special insn). So we couldn't use part of allocated
blocks for some control structures (this problem solved in your
implementation, it's common remark)
3) Obvious (IMHO) workflow of mem. allocator look like:
- at startup time, driver allocate some big
(almost) static mem. chunk(s) for a control/data structures.
- during work of the device, driver allocate many small
mem. blocks with almost identical size.
such behavior lead to degeneration of buddy method and
transform it to the first/best fit method (with long seek
by the free node list).
4) The simple binary buddy method is far away from perfect for a device
due to a big internal fragmentation. Especially for a
network/mfd devices, for which, size of allocated data very
often is not a power of 2.
I start to modify your code to satisfy above demands, but firstly I wish to
know your, or somebody else, opinion.
Especially I will very happy if somebody have and could provide to all, some
device specific memory usage statistics.
--
Regards
Andrey Volkov
------------------------------
Message: 5
Date: Wed, 21 Dec 2005 18:41:22 +0100
From: Alessandro Zummo <azummo-lists at towertech.it>
Subject: Re: [RFC] RTC subsystem
To: Simon Richter <Simon.Richter at hogyros.de>
Cc: linuxppc-dev at ozlabs.org, lm-sensors at lm-sensors.org,
linux-kernel at vger.kernel.org, linuxppc-embedded at ozlabs.org
Message-ID: <20051221184122.5253df01 at inspiron>
Content-Type: text/plain; charset=US-ASCII
On Wed, 21 Dec 2005 17:02:55 +0100
Simon Richter <Simon.Richter at hogyros.de> wrote:
> > the proposal actually had a fully-working patch attached :)
>
> Ah, didn't see that, as I just skimmed over the web archive page you
> linked to, which has no link to the actual patch (or I'm too stupid to
> find it).
right.. the link was to 0/6 of the patchset, which is
actually only the introduction. real patch was in subsequent
messages.
> > In my code, the first rtc that register is bound
> > to /proc/driver/rtc and /dev/rtc (if those interfaces
> > are compiled in, as they are all selectable).
>
> It would be good to have a way to change which clock is the "primary"
> one from userspace later (userspace because this is clearly site policy).
If I'm not wrong, the RTC is usually queried at bootup
and written to on shutdown. If NTP mode is active,
it is also written every 11 minutes.
So my intention was to emulate that interface as a starting
point. Then we can update the userspace utilities (hwclock)
to let the user choose which clock he want to use.
I guess /proc/driver/rtc will be deprecated sooner or
later. The /dev/rtc interface only supports one clock.
It can either be extended to have /dev/rtcX or we
can extend the sysfs one to allow clock updating.
NTP mode could then be adjusted to update one or more
of the rtcs. Maybe each RTC could have an attribute
(let's say /sys/class/rtc/rtcX/ntp) which tells the
kernel whether to update it or not.
This way we will not have a primary clock anymore.
> > You have full control of which functions you will provide
> > to the upper layer. Obivously if you try to set the
> > time on a read-only rtc, you will get an error.
>
> Sure. I was thinking of the question which error that should be.
-EPERM ? -EACCESS? :)
--
Best regards,
Alessandro Zummo,
Tower Technologies - Turin, Italy
http://www.towertech.it
------------------------------
Message: 6
Date: Thu, 22 Dec 2005 00:18:33 +0100
From: Simon Richter <Simon.Richter at hogyros.de>
Subject: Re: [RFC] RTC subsystem
To: Alessandro Zummo <azummo-lists at towertech.it>
Cc: linuxppc-dev at ozlabs.org, lm-sensors at lm-sensors.org,
linux-kernel at vger.kernel.org, linuxppc-embedded at ozlabs.org
Message-ID: <43A9E2C9.7080300 at hogyros.de>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
Alessandro Zummo schrieb:
>>It would be good to have a way to change which clock is the "primary"
>>one from userspace later (userspace because this is clearly site policy).
> If I'm not wrong, the RTC is usually queried at bootup
> and written to on shutdown. If NTP mode is active,
> it is also written every 11 minutes.
A good ntpd will adjust the speed rather than write to the clock; the
ntpd shipped by most distributions can already handle multiple time sources.
I'm thinking of the case where a computer is not attached to a network
but needs accurate tim; in this case I'd give it a battery powered RTC
and a time signal receiver. As most time signals are low-bandwidth, they
may not carry full time information in each tick so it may take several
minutes to fully synchronize. In this case I'd like to use the battery
backed up clock first and switch later on when synchronized.
> I guess /proc/driver/rtc will be deprecated sooner or
> later. The /dev/rtc interface only supports one clock.
> It can either be extended to have /dev/rtcX or we
> can extend the sysfs one to allow clock updating.
/dev is the way to go IMO. As far as I've understood sysfs, it carries
meta information about devices and drivers only, the actual
communication then happens through device nodes still.
> NTP mode could then be adjusted to update one or more
> of the rtcs. Maybe each RTC could have an attribute
> (let's say /sys/class/rtc/rtcX/ntp) which tells the
> kernel whether to update it or not.
That's entirely a userspace thing. What the userspace needs to know from
the kernel is whether the clock is writable and whether its speed can be
adjusted.
> -EPERM ? -EACCESS? :)
-EIO or -ENOSYS would also be possible options.
Simon
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