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Re: Doubt on first access for PCIe device

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On 04/11/2017 10:15 AM, abhijit wrote:

> Here I am assuming, the completer ID will be device number and function 
> number that will eventually programmed in to  device. In that case, my 
> question is, without first write, how read request(VENDOR ID read) is 
> serviced/routed?

You'll want to read about PCIe enumeration at boot time and how the BIOS
walks the topology to assign these (which an OS may later re-number). In
particular, read about ECAM for configuration. This uses memory mapped
config space read/write accessors that target a memory address space
under the control of the root complex.

Jon.

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Thread

Doubt on first access for PCIe device abhijit <abhijitnaik27@gmail.com> - 2017-04-11 16:20 +0200
  Re: Doubt on first access for PCIe device Jon Masters <jcm@jonmasters.org> - 2017-04-19 07:10 +0200
  Re: Doubt on first access for PCIe device Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-04-19 12:30 +0200
    Re: Doubt on first access for PCIe device Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-04-21 19:10 +0200
      Re: Doubt on first access for PCIe device abhijit <abhijitnaik27@gmail.com> - 2017-04-24 08:30 +0200
        Re: Doubt on first access for PCIe device Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-04-24 12:10 +0200
          Re: Doubt on first access for PCIe device abhijit <abhijitnaik27@gmail.com> - 2017-04-24 13:20 +0200
  Re: Doubt on first access for PCIe device abhijit <abhijitnaik27@gmail.com> - 2017-04-21 12:10 +0200

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