Re: Wrong format of kernel.img if build on Cygwin (was: no subject)

Re: Wrong format of kernel.img if build on Cygwin (was: no subject)

[Christian Franke]

Lode Leroy wrote:
>
>
>>  Did the core.img actually work as expected then?
>
> unfortunately no, it doesn't boot.
> booting the iso from grub-mkrescue in qemu I get the following message :
>
> Booting from CD-Rom...
> 1MB medium detected
> rub_env_seteub_exitub_fatal
> ===========  (these letters in reverse video)
>

This is possibly the problem that libbfd cannot not convert PE to ELF 
properly.
Unfortunately the grub-pe2elf tool does support pe-i386 but not pei-i386.

I will try to fix this next week.

-- 
Regards,
Christian Franke

(no subject)

[lode leroy]

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I tried compiling grub from bzr on cygwin.

grub-mkimage failed with the following error:

~/grub/build/grub-core $ ../grub-mkimage -v -O i386-pc -d . -o core.img biosdisk part_msdos fat ntfs
../grub-mkimage: info: getting the size of ./biosdisk.mod.
../grub-mkimage: info: getting the size of ./part_msdos.mod.
../grub-mkimage: info: getting the size of ./fat.mod.
../grub-mkimage: info: getting the size of ./fshelp.mod.
../grub-mkimage: info: getting the size of ./ntfs.mod.
../grub-mkimage: info: the total module size is 0x6280.
../grub-mkimage: info: getting the size of ./kernel.img.
../grub-mkimage: info: reading ./kernel.img.
../grub-mkimage: info: getting the size of ./kernel.img.
../grub-mkimage: error: invalid ELF header.

I found that the problem can be solved by replacing the following line in the Makefile

strip -v -R .rel.dyn -R .reginfo -R .note -R .comment  -o kernel.img kernel.exec.exe

by

strip -Felf32-i386 -v -R .rel.dyn -R .reginfo -R .note -R .comment  -o kernel.img kernel.exec.exe

-- lode
 		 	   		  

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Re: Wrong format of kernel.img if build on Cygwin (was: no subject)

[Christian Franke]

lode leroy wrote:
>      I tried compiling grub from bzr on cygwin.
> 
> grub-mkimage failed with the following error:
> 
> ~/grub/build/grub-core $ ../grub-mkimage -v -O i386-pc -d . -o
> core.img biosdisk part_msdos fat ntfs
> ../grub-mkimage: info: getting the size of ./biosdisk.mod.
> [...]
> ../grub-mkimage: info: getting the size of ./kernel.img.
> ../grub-mkimage: error: invalid ELF header.
> 

In the past (1.98), kernel.img was a raw binary. Now it is an ELF file
which requires extra conversion if build on Cygwin.

I will provide a patch to fix Cygwin build for 1.99.


> I found that the problem can be solved by replacing the following
> line in the Makefile
> 
> strip -v -R .rel.dyn -R .reginfo -R .note -R .comment  -o kernel.img
> kernel.exec.exe
> 
> by
> 
> strip -Felf32-i386 -v -R .rel.dyn -R .reginfo -R .note -R .comment 
> -o kernel.img kernel.exec.exe
>

Did the core.img actually work as expected then?


Thanks for the problem report.

-- 
Regards,
Christian Franke