I am Dushmanta , a CS PhD student at Georgia Institute of Technology, Atlanta, US. For one of my projects I am looking into Bitvisor details. But I am facing some issue with its compiling (Bitvisor 1.1.1). I am following the bitvisor1.1 manual found at <a href="http://www.bitvisor.org/" target="_blank">http://www.bitvisor.org/</a> . I hope you would be kind enough to help me with that. I can compile the elf image, but when I try to compile the configuration data (password login related module1.bin,module2bin), I get some errors. I use the default configurations and do not change anything in the configuration files (bitvisor.conf.tmpl) I have a recent Thinkpad T520 (quad core Intel i5) and my base OS is Ubuntu 11.04 (64bit). I have installed the necessary libraries (gcc, binutils, make, libssl-dev, libusb-dev etc). I am not sure what the issue is. My guess is, it might be related to binutils. Do I need to compile it in a 32bit OS? Do I need any cross compiler or gcc-multilib installed in my system? Here are just some print outs from the compilation process. Please let me know if you need any more details. ************************************* Final print outs from the elf image compilation make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/vpn' make -C ata/ make[2]: Entering directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/ata' make[2]: `driver.o' is up to date. make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/ata' make -C usb/ make[2]: Entering directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/usb' make[2]: `driver.o' is up to date. make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/usb' make -C vpn/ make[2]: Entering directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/vpn' make[2]: `driver.o' is up to date. make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/vpn' make -C ata/ make[2]: Entering directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/ata' make[2]: `driver.o' is up to date. make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/ata' make -C usb/ make[2]: Entering directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/usb' make[2]: `driver.o' is up to date. make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/usb' make -C vpn/ make[2]: Entering directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/vpn' make[2]: `driver.o' is up to date. make[2]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers/vpn' ld -melf_x86_64 -g -nostdlib -r -o drivers.o bios32.o core.o dmar.o ieee1394.o iommu.o pci_conceal.o pci_core.o pci_debug.o pci_init.o security.o smi.o ata/driver.o usb/driver.o vpn/driver.o make[1]: Leaving directory `/home/dm/secvirt/bitvisor/bitvisor-1.1.1/drivers' ld -melf_x86_64 -g -nostdlib -T bitvisor.lds --cref -Map bitvisor.map -o bitvisor.elf core/core.o drivers/drivers.o storage/storage.o vpn/vpn.o idman/idman.o crypto/crypto.a ld: error in idman/idman.o(.eh_frame); no .eh_frame_hdr table will be created. objcopy --output-format elf32-i386 bitvisor.elf From the module compilations: root@dm-ThinkPad-T520:~/secvirt/bitvisor/bitvisor-1.1.1/boot/login-simple# make gcc -Wall -s -Wl,-Ttext,0x8000 -nostdlib -nostdinc \ -idirafter ../../include -o module1.bin asm.s main.c asm.s: Assembler messages: asm.s:40: Error: operand type mismatch for `push' main.c:162:1: warning: conflicting types for built-in function ‘strlen’ main.c: In function ‘os_main’: main.c:217:13: warning: cast from pointer to integer of different size main.c:219:13: warning: cast from pointer to integer of different size make: *** [module1.bin] Error 1