"30 days to write operating system" How to make USB drive boot

The author read the "30 days to write the operating system", I would like to install a B, so I have been very much want to "30 days to write operating system" program is not just running in the virtual machine, but also want to put this OS on the U disk, starting from the U disk, the online search for a variety of methods have not realized my great ideal So I can do it by myself. Below is my test computer screen is broken, but still see clearly

The following is the step

First to http://zhidao.baidu.com/share/cc93285a8dc709f2cbd8af39eaae61bd.html download the USB drive format into a floppy disk tool, format the USB drive

2--Replace your IPL code with the following IPL code (in fact the entire porting to the USB drive core is to modify the IPL code)

; Haribote-ipl
; Tab=4
Cyls EQU 10 ; 10 Cylinders
ORG 0x7c00; MBR in memory position (DS=0,0X07C00=DS+0X7C00)


; System-related setup information
JMP Entry
Db 0x90
Db "HELLOIPL"; Name of the boot sector
Dw 512; Size of Sector
Db 1; F
Dw 1; FAT First Sector
Db 2; FAT number
Dw 224; Root dir size
Dw 2880; Disk size in Sector
Db 0xf0; Disk type
Dw 9; FAT length
Dw 18; Sector each Road
Dw 2; Disk Up Down
Dd 0; No partition
Dd 2880; Reclaim the disk size
Db 0,0,0x29; Reserve
Dd 0xFFFFFFFF; Might be column
Db "Hello-os"; Disk Name
Db "FAT12"; Disk FS Type
Resb 18; Reserve byte


; Init Program Entry


Entry
MOV ax,0;
MOV Ss,ax
MOV Sp,0x7c00; Heap Stack Init
MOV Ds,ax; Initialize code snippet base address in 0x00000


; Read disk-to-memory 0x08200 location


MOV ax,0x0820
MOV Es,ax
MOV ch,0; Cylinder number
MOV dh,0; Disk Head number
MOV cl,2; Sector number
Readloop:
MOVsi,0; Failed times
; Retry to read disk if failed, read one sector
Retry
MOV ah,0x02; AH=0X02: Read disk
MOV al,1; 1 sectors
MOV bx,0
; MOV dl,0x00; A drive
MOV dl,0x80
Int 0x13; function routines that call the BIOS
JNC Next
ADD si,1
Cmpsi,5
JAE Error
MOVah,0x00
; MOVdl,0x00
MOVdl,0x80
Int 0x13
JMPRetry
Next
MOV Ax,es
ADD ax,0x0020; backward offset per sector memory read (es+=0x0020) <<4
MOV Es,ax
ADD cl,1
Cmpcl,62; 62 sectors
Jbe Readloop
MOVcl,1
ADDdh,1
Cmpdh,2
Jb Readloop
MOVdh,0
ADDch,1
Cmp ch,4
JbReadloop
MOV [0x0ff0],ch
JMP0xc200
Error
MOV Si,msg
JMPPutloop
Ok:
MOV Si,msg1
Putloop:
MOV AL,[SI]
ADD si,1; Si set to 1
Cmp al,0
JE Fin
MOV ah,0x0e; displaying characters in teletype mode
MOV bx,15; Page bh=0x00, foreground color bl=0x0f
Int 0x10; BIOS Display Service
JMP Putloop
Fin
HLT ; Pause processor
JMP Fin
MSG1:
Db 0x0a, 0x0a; Line break
Db "READ okkkk"
Db 0x0a; Line break
Db 0
Msg
Db 0x0a, 0x0a; Line break
Db "Load Error"
Db 0x0a; Line break
Db 0


Resb 0x7dfe-$; (0x7dfe-current position) are populated with 0x00


Db 0x55, 0xaa

3--compiled to your img file

4--use Ubuntu or other system dd command to copy your img to the USB stick (dd if=xxxx.img of=/dev/sdb) Ps:/dev/sdb This is the name of my USB flash drive on my system, there may be other names, depending on the circumstances

5--put your USB stick on the real machine, turn on the power (My Computer is F12 Select Startup item) Select the USB stick boot

6--can see the effect of running on a real computer.

"30 days to write operating system" How to make USB drive boot