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Re: Re: Re: help, question on pci communication!

To: invictus rm <invictus_rm@hotmail.com>
Subject: Re: Re: Re: help, question on pci communication!
From: "Guangxing Zhang" <guangxing@ict.ac.cn>
Date: Mon, 29 Sep 2003 9:28:20 +0800
Cc: linux-mips@linux-mips.org <linux-mips@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
Hi,

        Thank your for your help.
    Other troublesome things to me ,so long time to see my mail.
    I will try to read it and find to know how , the result will be mailed to 
you if i have any tried.
    Thank you again for your enthusiastic advice. 

======= invictus_rm@hotmail.com 2003-09-25 20:01:00 WROTE:=======

>http://www.xml.com/ldd/chapter/book/ch13.html
>search for ioermap in this web page
>
>hope this helps
>
>rm
>
>
>>From: "Guangxing Zhang" <guangxing@ict.ac.cn>
>>To: invictus rm <invictus_rm@hotmail.com>
>>CC: linux-mips@linux-mips.org <linux-mips@linux-mips.org>, angela 
>><jhyang@ict.ac.cn>, Fuxin Zhang <fxzhang@ict.ac.cn>
>>Subject: Re: Re: help, question on pci communication!
>>Date: Thu, 25 Sep 2003 9:41:35 +0800
>>
>>Hi, invictus rm
>>       Thank you very much for your enthusiastic help.
>>       I think it will be BIG help to me.Thank you.
>>       There is some thing i want to see your advise and help again.
>>       In BCM1250 we run the mips-linux which is customer compiled by us,
>>and in the  MCP750 there is linux too.What i want to implement is
>>transfering  data from BCM1250 to MCP750 through PCI.And using "dmesg"
>>i found the following info:(In BCM1250 ,MIPS-LINUX)
>>---------------------------------------------------------------------------------------------------------------------
>>.............
>>     Jan  1 00:00:11 (none) kernel: Determined physical RAM map:
>>     Jan  1 00:00:11 (none) kernel:  memory: 003a7000 @ 00000000 (usable)
>>Jan  1 00:00:11 (none) kernel:  memory: 0f711000 @ 0075c000 (usable)
>>Jan  1 00:00:11 (none) kernel:  memory: 1ffffe00 @ 80000000 (usable)
>>Jan  1 00:00:11 (none) kernel:  memory: 0ffffe00 @ c0000000 (usable)
>>Jan  1 00:00:11 (none) kernel:  memory: 003b5000 @ 003a7000 (reserved)
>>Jan  1 00:00:11 (none) kernel: 2815MB HIGHMEM available.
>>Jan  1 00:00:11 (none) kernel: Initial ramdisk at: 0x803a7000 (3887104 
>>bytes)
>>Jan  1 00:00:11 (none) kernel: On node 0 totalpages: 851967
>>Jan  1 00:00:11 (none) kernel: zone(0): 131072 pages.
>>Jan  1 00:00:11 (none) kernel: zone(1): 0 pages.
>>Jan  1 00:00:11 (none) kernel: zone(2): 720895 pages.
>>@ Jan  1 00:00:11 (none) kernel: Kernel command line: root=/dev/ram0 rw 
>>bigphysarea=8192 pcisharesize=16
>>@ Jan  1 00:00:11 (none) kernel: pcisharemem allocated @ 85800000
>>...................
>>---------------------------------------------------------------------------------------------------------------------
>>     In the above lines tagged with @ i notice that there is 
>>"bigphysarea=8192 pcisharesize=16",
>>I have read "kernel/include/linux/mm/bigphysarea.h" ,and known that 
>>bigphysarea can be used
>>to reserve some amount of physical memory at boot-time for PCI 
>>communication.A friend told me
>>using it is simple ,but he did not tell me kow :-)~(Of course i think he 
>>knows it from others).
>>And i think in my kernel module i can implement it.Without any knowledge on 
>>it ,I am swamped now.
>>Can you give me some info on how to do that ,such as how to use the 
>>"bigphysarea"?How the MCP750
>>see the "bigphysarea" in BCM1250 and access it (read it)?
>>     I think i am so avaricious , but i really thirst for the help and 
>>advice.
>>     Thank you again and in advance again.:-)~
>>
>>
>>======= invictus_rm@hotmail.com 2003-09-24 23:15:00 WROTE:=======
>>
>> >hi,
>> >
>> >  If the BCM1250 is operating in the device mode in the peripheral slot 
>>of
>> >the CPCI chassis, u need t get the enumeration of the PCI being done from
>> >MCP 750 right.
>> >  The code for MCP750 alread exists in the linux kernel ( if i remember
>> >correctly).
>> >
>> >U can proceed in the following directions-->
>> >(a) Get the PCI enumeration working properly on the MCP750 ( look at the
>> >ouput of lspci -vvv to decide whether resource allocation is proper or 
>>not)
>> >.. The powerpc provides a fairly comprehensive PCI enumeration code(
>> >including scanning beyond the bridge).
>> >
>> >(b) Once u are able to see ur device in the lspci output on the MCP board 
>>,
>> >u can load the driver ( ur custom driver ) to do the transfer from the
>> >BCM1250 to MCP and vice versa.
>> >
>> >(v) Look at the few PCI based drivers about the way the data transfers is
>> >handled specially pci_alloc_* / pci_map_*/pci_resource_*.........
>> >
>> >Hope this helps
>> >
>> >
>> >
>> >
>> >>From: "Guangxing Zhang" <guangxing@ict.ac.cn>
>> >>To: Fuxin Zhang <fxzhang@ict.ac.cn>
>> >>CC: linux-mips@linux-mips.org <linux-mips@linux-mips.org>, angela
>> >><jhyang@ict.ac.cn>
>> >>Subject: help, question on pci communication!
>> >>Date: Wed, 24 Sep 2003 16:29:32 +0800
>> >>
>> >>Hi, Fuxin and everyone see this mail,
>> >>     In linux world ,newbies always like to ask and the veterans will
>> >>always be enthusiastic.:)~~
>> >>     Now there is a "ask", of course i am a newbie.
>> >>     Follow is the  architecture  which we are working on.
>> >>     Now i want to transfer the data from the "sb1250" to mcp750 through
>> >>the PCI bus with the help of 21555 bridge.
>> >>I want to implement it in kernel module.Although knowing "use the force
>> >>,read source",but i really do not know
>> >>how and where to begin.
>> >>     Is there any advice on it ? How to implement the communication 
>>through
>> >>PCI (or PCI-to-PCI bridge) in kernel
>> >>moudle?
>> >>     Any help will be appreciated!Thank in advance!
>> >>
>> >>                       -------------
>> >>                   |  MCP 750  |  (Power PC)
>> >>                       -------------
>> >>                             |
>> >>      -------------------------------------------CPCI
>> >>                          |
>> >>              ---------------|--------------------------------
>> >>              |      --------|-----                         |
>> >>              |      |Intel 21555 |(PCI-TO-PCI Bridge)      |
>> >>              |      --------------                         |
>> >>              |        |                        |
>> >>              |      --------(PCI bus)        |
>> >>    |          |                                  |
>> >>    |       --------                              |
>> >>    |   |SB1250|(CPU)                         |
>> >>    |       --------                              |
>> >>              ----------------------------------------------
>> >>        Guangxing Zhang
>> >>        guangxing@ict.ac.cn
>> >>       2003-09-24 16:03:04
>> >>          
>> >>
>> >>
>> >>
>> >>
>> >
>> >_________________________________________________________________
>> >Talk to Karthikeyan. Watch his stunning feats.
>> >http://server1.msn.co.in/sp03/tataracing/index.asp Download images.
>>
>>= = = = = = = = = = = = = = = = = = = =
>>
>>
>>
>>        Guangxing Zhang
>>        guangxing@ict.ac.cn
>>        2003-09-25 08:43:44
>>
>>
>>
>
>_________________________________________________________________
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        Guangxing Zhang
        guangxing@ict.ac.cn
        2003-09-29 09:24:33




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