0x1d0 unsigned long EFI memory descriptor map pointer
0x1d4 unsigned long EFI memory descriptor map size
0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
+0x1e4 unsigned long Scratch field for the kernel setup code
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)
2 for bootsect-loader
3 for SYSLINUX
4 for ETHERBOOT
+ 5 for ELILO
+ 7 for GRuB
+ 8 for U-BOOT
+ 9 for Xen
V = version
0x211 char loadflags:
bit0 = 1: kernel is loaded high (bzImage)