Re: [ppc patch] shrink grubof build

[Hollis Blanchard]

On Sep 14, 2004, at 9:57 AM, Alan Modra wrote:

> On Tue, Sep 14, 2004 at 09:47:56AM -0500, Hollis Blanchard wrote:
> > grubof -S: 166131 bytes; objcopy -O binary: 146224 bytes
> >   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg
> > Align
> >   LOAD           0x010000 0x00200000 0x00200000 0x13d68 0x13d68 R E
> > 0x10000
> >   LOAD           0x023d68 0x00223d68 0x00223d68 0x001b0 0x08bd4 RW
> > 0x10000
>
> From the above, I'd say the wasted space is the nearly 64k between the
> end of elf headers and start of .text.  You have a section alignment of
> 64k for some reason..  If you changed .text to start at
> 0x10000+SIZEOF_HEADERS, you'd find the image packed into the file
> better.

However, objcopy -O binary will omit that space. So even in the case 
above, with the text segment offset 64K into the file, I would still 
expect objcopy to emit a file 0x13d68 + 0x001b0 bytes long (objcopy 
does not insert zeros for BSS).

That file would be 81688 bytes, but here we see objcopy emitting 146224 
bytes.

-Hollis