PCIe communication at linux command in grub-core/loader/i386/linux.c

PCIe communication at linux command in grub-core/loader/i386/linux.c

[Arindam Khan]

Hi,

   I have a PCIe 4x card in PCIe slots, which does a communication to card, before “linux” command is loaded. I had an implementation of PCIe communication which perfectly works for BIOS based system. However, when i configure he GRUB2 for EFI system and install it, the same communication to PCIe board does not occur. It is not able to read/write BAR2 address and giving communication error.


I have following questions in this regard - 
a) Is any changes in GRUB2 for UEFi system for PCIe communication
b) TLP packet generated for PCIe communication uses 32-bit or 64-bit address?. Because BIOS uses 32-bit address only for PCIe TLP.

with regards,
Arindam 

Fwd: PCIe communication at linux command in grub-core/loader/i386/linux.c

[Arindam Khan]

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> Begin forwarded message:
> 
> From: Arindam Khan <arindamkhan2003@gmail.com>
> Subject: PCIe communication at linux command in grub-core/loader/i386/linux.c
> Date: 2 September 2017 at 09:48:40 IST
> To: grub-devel@gnu.org
> 
> Hi,
> 
>   I have a PCIe 4x card in PCIe slots, which does a communication to card, before “linux” command is loaded. I had an implementation of PCIe communication which perfectly works for BIOS based system. However, when i configure he GRUB2 for EFI system and install it, the same communication to PCIe board does not occur. It is not able to read/write BAR2 address and giving communication error.
> 
> 
> I have following questions in this regard - 
> a) Is any changes in GRUB2 for UEFi system for PCIe communication
> b) TLP packet generated for PCIe communication uses 32-bit or 64-bit address?. Because BIOS uses 32-bit address only for PCIe TLP.
> 
> with regards,
> Arindam


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