RS / RSPRO FreeBSD

[Warner Losh]

On 02/01/2011 03:33, Jayachandran C. wrote:
> On Tue, Feb 1, 2011 at 3:02 PM, Monthadar Al Jaberi<monthadar at gmail.com>  wrote:
>> Sure,
>>
>> I used the standard kernel configuration file and modifed this:
>> options                 MD_ROOT
>> options                 MD_ROOT_SIZE=40960
>> options                 ROOTDEVNAME=\"ufs:md0\"
>>
>> to generate filesystem:
>> makefs -t ffs -B big -s 40m rootfs.img path-to-filesystem/
>>
>> to embedd the filesystem (script code):
>> addr=($(strings -td kernel | grep "MFS Filesystem" | awk '{print
>> $1}')) #calculate start and end address for mdroot
>> rootfs_start=${addr[0]}
>> rootfs_end=$((${addr[1]}+1))
>> echo "Generating kernel image"
>> head -c ${rootfs_start} kernel>  kernel.new
>> cat rootfs.img>>  kernel.new
>> tail -c +${rootfs_end} kernel>>  kernel.new
>> gzip -9 kernel.new
>>
>> Sorry for the extreme delay, hope it helps...
> You can just set the MFS_IMAGE environment variable, and the 'make
> buildkernel' will patch the mfs image during the kernel build process.
> The script it uses is sys/tools/embed_mfs.s

while that is true, I wonder if anybody has tried to create a linker 
script that would allow you to add the MFS image as an ELF section and 
use ldscript magic to get the start/end address.  This would allow you 
to generate MFS images of different sizes and attach them to the same 
kernel.

Warner