"Error 28" -problem on an old 386

[Riku 'Rakkis' Nurminen]

Hi,

I'm posting this message here as the new Bug Tracking System site seems
to be unworking at the moment. (I'm only seeing some "connection refused"
message upon entering).

I'm trying to boot my own tiny kernel (8.5KB, ELF format) from a floppy
disk with GRUB. Everything worked fine when my kernel was < 6KB in size,
but now in its current size I always get the following error when
booting:

[]
...
kernel /boot/rkernel
    [Multiboot-elf, <0x0:0xac1:0x0>

Error 28: Selected item cannot fit into memory

[]

The computer is an old 386SX with 4MB RAM. I've tested it with both 0.93
and CVS GRUB (from today). Grub reports the machine's memory as
639K lower / 3456K upper.

I've set the physical and virtual load address of the kernel to 1MB
(0x100000). This can be verified from the objdump output:

[]
$ objdump -f -h build/rkernel

build/rkernel:     file format elf32-i386
architecture: i386, flags 0x00000102:
EXEC_P, D_PAGED
start address 0x00100000

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00002000  00100000  00100000  00001000  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .data         00001000  00102000  00102000  00003000  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00001000  00103000  00103000  00004000  2**5
                  ALLOC
  3 .rodata.str1.32 00000742  00000100  00000100  00000100  2**5
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  4 .rodata.str1.1 0000027f  00000842  00000842  00000842  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
[]

According to this the kernel should end at 0x105000 (1044KB). After that
there should still be plenty (~3MB) of RAM available.

Thanks in advance for any help.

                Riku "Rakkis" Nurminen
                Personal: http://www.rakkis.net
                Member of: http://www.madqon.org