9.11. PCI NTB Endpoint Function — The Linux Kernel 6.12.93-gnu-rt18-parabola1-1-rt-lts documentation

# 9.11. PCI NTB Endpoint Function

1. Create a subdirectory to pci_epf_ntb directory in configfs.

Standard EPF Configurable Fields:

vendorid | should be 0x104c
deviceid | should be 0xb00d for TI’s J721E SoC
revid | don’t care
progif_code | don’t care
subclass_code | should be 0x00
baseclass_code | should be 0x5
cache_line_size | don’t care
subsys_vendor_id | don’t care
subsys_id | don’t care
interrupt_pin | don’t care
msi_interrupts | don’t care
msix_interrupts | don’t care

2. Create a subdirectory to directory created in 1

NTB EPF specific configurable fields:

db_count | Number of doorbells; default = 4
mw1 | size of memory window1
mw2 | size of memory window2
mw3 | size of memory window3
mw4 | size of memory window4
num_mws | Number of memory windows; max = 4
spad_count | Number of scratchpad registers; default = 64