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