From: Michael Brown <mcb30@ipxe.org>
Date: Wed, 23 Jul 2025 15:11:09 +0000 (+0100)
Subject: [pxeprefix] Display PCI vendor and device ID in PXE startup banner
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65b8a6e459392cd732766c54294daaf3ca2e250d;p=thirdparty%2Fipxe.git

[pxeprefix] Display PCI vendor and device ID in PXE startup banner

In the case of a misbehaving PXE stack, it is often useful to know the
PCI vendor and device IDs (e.g. for adding the device to the list of
devices with known broken support for generating interrupts).

The PCI vendor and device ID is already available to the prefix code,
and so can trivially be printed out.  Add this information to the PXE
prefix startup banner.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---

diff --git a/src/arch/x86/prefix/pxeprefix.S b/src/arch/x86/prefix/pxeprefix.S
index 2ac1bc76d..067af99fa 100644
--- a/src/arch/x86/prefix/pxeprefix.S
+++ b/src/arch/x86/prefix/pxeprefix.S
@@ -366,6 +366,14 @@ pci_physical_device:
 	movw	$10f, %si
 	call	print_message
 	call	print_pci_busdevfn
+	movb	$( ' ' ), %al
+	call	print_character
+	movw	pci_vendor, %ax
+	call	print_hex_word
+	movb	$( ':' ), %al
+	call	print_character
+	movw	pci_device, %ax
+	call	print_hex_word
 	jmp	99f
 	.section ".prefix.data", "aw", @progbits
 10:	.asciz	"PCI "