0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
0x1e8 char number of entries in E820MAP (below)
0x1e9 unsigned char number of entries in EDDBUF (below)
+0x1ea unsigned char number of entries in EDD_MBR_SIG_BUFFER (below)
0x1f1 char size of setup.S, number of sectors
0x1f2 unsigned short MOUNT_ROOT_RDONLY (if !=0)
0x1f4 unsigned short size of compressed kernel-part in the
0x21c unsigned long INITRD_SIZE, size in bytes of ramdisk image
0x220 4 bytes (setup.S)
0x224 unsigned short setup.S heap end pointer
-0x2cc 4 bytes DISK80_SIG_BUFFER (setup.S)
+0x290 - 0x2cf EDD_MBR_SIG_BUFFER (edd.S)
0x2d0 - 0x600 E820MAP
-0x600 - 0x7ff EDDBUF (setup.S) for disk signature read sector
-0x600 - 0x7eb EDDBUF (setup.S) for edd data
+0x600 - 0x7ff EDDBUF (edd.S) for disk signature read sector
+0x600 - 0x7eb EDDBUF (edd.S) for edd data