2
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1answer
204 views

PCI BAR memory addresses

Quick question, I was reading the OSDev Wiki page regarding PCI and it says the following - Base address Registers (or BARs) can be used to hold memory addresses used by the device, or offsets for ...
1
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2answers
62 views

Are all peripherals directly connected to system bus?

System bus has control, address and data buses, as we can see in this picture I think the front-side bus and memory bus is directly on the system bus, but what about the PCIExpress and PCI buses, ...
0
votes
0answers
154 views

PCI Express BAR memory mapping basic understanding

I am trying to understand how PCI Express works so i can write a windows driver that can read and write to a custom PCI Express device with no on-board memory. I understand that the Base Address ...
1
vote
1answer
859 views

PCI Express - Memory Addressing vs Physical Memory in Memory Read/Write Transactions

I'm trying to find the link between Memory BARs (Base Address Registers) and Physical Memory in a PCI Express Transactions. In my last question I started to understand what happens when a CPU ...
2
votes
1answer
2k views

PCI Express - Clarification about BAR, Memory addressing and physical memory

I'm an absolute beginner starting to understand the PCI Express protocol and I need some clarifications about its mechanics. I understood that a PCI Express endpoint device may have some memory BAR ...
0
votes
2answers
4k views

How are PCI/PCIe BARs configured to access memory on the device?

In my previous question, I established that the memory address used by PCI/PCIe devices does not have to mapped to system RAM, but could also refer to "on device" memory, e.g. RAM or registers. But ...
2
votes
1answer
2k views

Clarification of the difference between PCI memory addressing and I/O addressing?

Could someone please clarify the difference between memory and I/O addresses on the PCI/PCIe bus? I understand that I/O addresses are 32-bit, limited to the range 0 to 4GB, and do not map onto system ...
1
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1answer
2k views

“Error allocating I/O BAR for PCI device” when booting Windows 7 [duplicate]

Possible Duplicate: Error allocating Mem BAR for PCI Device 0X/00/0. I have a Dell Optiplex 380. When I try to boot Windows 7 normally I get the following after the Windows loading screen: ...
1
vote
2answers
258 views

Does PCI bus really occupy 1.8GB

I am using a Dell Vostro 1700 laptop which currently has 2GB of RAM. I was considering buying some more memory to upgrade it to 4GB. I am running 32 bit Windows Vista and I know that there can be ...
0
votes
2answers
396 views

Is there a tool to list the memory allocation of all PCI drivers (WinXP)?

Windows XP is just using 2.5GB of the 3.5GB installed. Is there a simple way to see which PCI driver allocates how much of memory? I'm looking for something that shows me this data on a single screen ...
2
votes
5answers
2k views

PCI cards fail when using 4 gig ram

I recently installed 4 gig or ram into my 32bit vista box. I realize that I wont be able to use the entire 4 gig until I go to 64bit vista, but 2 gig wasn't enough and I figured I could use as much ...