String writing does not appear to be working

[Sebazzz]

The code used to write a string, exercise 7.5.1, does not appear to be working. Specifically the string is not written to screen, even though multiple manual calls to my PutChar implementation do work. Even not the reference implementation was able to write the string to the display. Stripped down code:

bits 16
start: jmp boot

boot:
  cli	; no interrupts
  cld	; all that we need to init
  
  call PrintBootMsg
  hlt	; halt the system

   ; dl = x; dh = y
MovCursor:
; [redacted]
   ret

   ; al = chr, cx = repeat
PutChar:
;   [...] (redacted, is functional though)
   ret
   
   ;; ds:si = Zero terminated string
Print:
.loop:
   lodsb
   or al, al
   jz .done
   mov cx, 1
   call PutChar
   jmp .loop
   
   .done:
   ret
   
; Print the boot message
PrintBootMsg:
   ; Reset cursor
   mov bh, 0
   mov bl, 0
   call MovCursor
  
   ; Print
   mov si, bootMsg
   call Print
   ret
   
   ;; constant and variable definitions
bootMsg db "Booting the Operating System!", 10, 13, 0
cursor_X db 0
cursor_Y db 0

   ; We have to be 512 bytes. Clear the rest of the bytes with 0
times 510 - ($-$$) db 0

dw 0xAA55   ; Boot Signature

The string does appear to be compiled in the binary, but not loading in memory. I tried inspecting the system memory with gdb x/512sb but I couldn't find any trace of the string. Moving the db instructions above does have effect on the output file but not on actual program execution.

Using NASM version 2.10.09.

[Sebazzz]

Based on on another hello world example it appears a org x7c00 instruction needs to be present

[tuhdo]

Hmm it's true. 0x7c00 is in my linker script though. Probably I forgot to add it.

[Sebazzz]

Ah, I see it now. However, that linker script is introduced after the first exercise.

[tuhdo]

Yes, I will need to update the book. Thanks for the report.