Как увеличить объём памяти для переменных и функций ядра в ld?

есть ядро, но при достижении определённого количество кода, не работают string literal в C и некоторые функции, но если меньше кода, то всё работает.

Вот код загрузчика на NASM, mbr.asm:

[org 0x7c00]
KERNEL_OFFSET equ  0x1000 ; The same one we used when linking the kernel

mov [BOOT_DRIVE], dl ; Remember that the BIOS sets us the boot drive in 'dl' on boot
mov bp, 0x9000
mov sp, bp

mov bx, MSG_16BIT_MODE
call print16
call print16_nl

call load_kernel ; read the kernel from disk
call switch_to_32bit ; disable interrupts, load GDT,  etc. Finally jumps to 'BEGIN_PM'
jmp $ ; Never executed

%include "boot/print-16bit.asm"
%include "boot/print-32bit.asm"
%include "boot/disk.asm"
%include "boot/gdt.asm"
%include "boot/switch-to-32bit.asm"

[bits 16]
load_kernel:
    mov bx, MSG_LOAD_KERNEL
    call print16
    call print16_nl

    mov bx, KERNEL_OFFSET ; Read from disk and store in 0x1000
    mov dh, 54
    mov dl, [BOOT_DRIVE]
    call disk_load
    ret

[bits 32]
BEGIN_32BIT:
    mov ebx, MSG_32BIT_MODE
    call print32
    call KERNEL_OFFSET ; Give control to the kernel
    jmp $ ; Stay here when the kernel returns control to us (if ever)


BOOT_DRIVE db 0 ; It is a good idea to store it in memory because 'dl' may get overwritten
MSG_16BIT_MODE db "Started in 16-bit Real Mode", 0
MSG_32BIT_MODE db "Landed in 32-bit Protected Mode", 0
MSG_LOAD_KERNEL db "Loading kernel into memory", 0

; padding
times 510 - ($-$$) db 0
dw 0xaa55

disk.asm:

; load 'dh' sectors from drive 'dl' into ES:BX
disk_load:
    pusha
    ; reading from disk requires setting specific values in all registers
    ; so we will overwrite our input parameters from 'dx'. Let's save it
    ; to the stack for later use.
    push dx

    mov ah, 0x02 ; ah <- int 0x13 function. 0x02 = 'read'
    mov al, dh   ; al <- number of sectors to read (0x01 .. 0x80)
    mov cl, 0x02 ; cl <- sector (0x01 .. 0x11)
                 ; 0x01 is our boot sector, 0x02 is the first 'available' sector
    mov ch, 0x00 ; ch <- cylinder (0x0 .. 0x3FF, upper 2 bits in 'cl')
    ; dl <- drive number. Our caller sets it as a parameter and gets it from BIOS
    ; (0 = floppy, 1 = floppy2, 0x80 = hdd, 0x81 = hdd2)
    mov dh, 0x00 ; dh <- head number (0x0 .. 0xF)

    ; [es:bx] <- pointer to buffer where the data will be stored
    ; caller sets it up for us, and it is actually the standard location for int 13h
    int 0x13      ; BIOS interrupt
    jc disk_error ; if error (stored in the carry bit)

    pop dx
    cmp al, dh    ; BIOS also sets 'al' to the # of sectors read. Compare it.
    jne sectors_error
    popa
    ret


disk_error:
    mov bx, DISK_ERROR
    call print16
    call print16_nl
    mov dh, ah ; ah = error code, dl = disk drive that dropped the error
    call print16_hex ; check out the code at http://stanislavs.org/helppc/int_13-1.html
    jmp disk_loop

sectors_error:
    mov bx, SECTORS_ERROR
    call print16

disk_loop:
    jmp $

DISK_ERROR: db "Disk read error", 0
SECTORS_ERROR: db "Incorrect number of sectors read", 0

linker.ld:

ENTRY(_start_kernel)

SECTIONS
{
    . = 0x1000;

    .text BLOCK(0x1000) : ALIGN(0x1000)
    {
        *(.text)
    }

    .rodata BLOCK(0x1000) : ALIGN(0x1000)
    {
        *(.rodata)
    }

    .data BLOCK(0x1000) : ALIGN(0x1000)
    {
        *(.data)
    }

    .bss BLOCK(0x1000) : ALIGN(0x1000)
    {
        *(COMMON)
        *(.bss)
    }
}