Re: BOOT_CS

[hpa@zytor.com (H. Peter Anvin)]

Followup to:  <20040224100530.68794.qmail@web11805.mail.yahoo.com>
By author:    =?iso-8859-1?q?Etienne=20Lorrain?= <etienne_lorrain@yahoo.fr>
In newsgroup: linux.dev.kernel
> 
>   The other problem is for the people who want to check the validity
>  of the RAM disk before starting Linux - for instance by checking
>  the CRC32 of the decompressed RAM disk - and stop the boot process
>  before it is too late - i.e. in the bootloader when you can select
>  another kernel version / initrd to load.
>   You cannot place the decompressed initrd at a maximum address before
>  knowing its decompressed size - the address to place it is the max
>  address (or the end of free RAM) minus ramdisk size if I remember
>  correctly. That is working for so long loading the decompressed
>  initrd after few Mb after the last kernel byte (so that the kernel
>  will move it where it wants - no need to move it twice) that I do
>  not remember the details. Did you changed this part?
> 

If you absolutely want to do this -- for pretty much no reason -- you
can either decompress it twice, decompress it to nowhere (after all,
the kernel will decompress it when it starts) or move it into place
before starting the kernel.

	-hpa