From 64a0c6073b46a09ecbc429442d966a2d3bdc1c67 Mon Sep 17 00:00:00 2001
From: Bryce Lanham <blanham@gmail.com>
Date: Sat, 22 Apr 2023 01:22:36 -0500
Subject: [PATCH] Fix PXE BIOS boot when using a proxy DHCP server

---
 common/pxe/pxe.h     | 1 +
 common/pxe/tftp.s2.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/common/pxe/pxe.h b/common/pxe/pxe.h
index bbb9d087..e80c7150 100644
--- a/common/pxe/pxe.h
+++ b/common/pxe/pxe.h
@@ -88,6 +88,7 @@ struct bangpxe {
 } __attribute__((packed));
 
 #define PXENV_GET_CACHED_INFO 0x0071
+#define PXENV_PACKET_TYPE_CACHED_REPLY 3
 struct pxenv_get_cached_info {
     uint16_t status;
     uint16_t packet_type;
diff --git a/common/pxe/tftp.s2.c b/common/pxe/tftp.s2.c
index 7fdc9829..db32b5d6 100644
--- a/common/pxe/tftp.s2.c
+++ b/common/pxe/tftp.s2.c
@@ -14,7 +14,7 @@
 
 static uint32_t get_boot_server_info(void) {
     struct pxenv_get_cached_info cachedinfo = { 0 };
-    cachedinfo.packet_type = 2;
+    cachedinfo.packet_type = PXENV_PACKET_TYPE_CACHED_REPLY;
     pxe_call(PXENV_GET_CACHED_INFO, ((uint16_t)rm_seg(&cachedinfo)), (uint16_t)rm_off(&cachedinfo));
     struct bootph *ph = (struct bootph*)(void *) (((((uint32_t)cachedinfo.buffer) >> 16) << 4) + (((uint32_t)cachedinfo.buffer) & 0xFFFF));
     return ph->sip;