PAE Issue

[sushilk]

Hi,

I need to install Nexpose community edition in BT5 R3.
Presently using BT5 R3 in vmware workstation9. Assigned 6 GB of Ram to VM Machine but 32 bit of BT5 Gnome only shows up around 3GB Ram.

To overcome this followed the linked
http://www.backtrack-linux.org/wiki/...php/PAE_kernel
and checked cat/proc/meminfo and it only shows around 3GB of RAM stilll.So is Nexpose gives the error of less memory.

I can check under /usr/src/linux# make menuconfig maximum memory being set afteer reboot is 64GB.

Is there any possibilty if this can be resolved or something I am missing?

Regards,
Sushil

[maverik35]

PAE means Physical Address Extension..If you have a 32-bit OS in linux, you have this option, to install a PAE kernel to address more than the 32-bit OS memory boundary (3Gb)...In 64bit arquitecture, you do not have that problem...So if you have a 32bit processor and want to address more than 3Gb boundary, yes you need a kernel to do so.

If you have a 64Bit processor, use a 64bit distro and solve the memory boudary issue.

There are other Kernels who will do the same thing, but in BT5 the PAE is the one used according to wiki...

[intrnd]

I just got it to boot to the new kernel finally. The guide we were following is missing a couple of important steps:

cp /usr/src/linux-source-`uname -r`/arch/x86/boot/bzImage /boot/vmlinuz-`uname -r`-hmem
cp /usr/src/linux-source-`uname -r`/System.map /boot/System.map

(These steps copy the modified kernel in the the /boot directory where they can be picked up by the update-grub2 command)

I got those steps from the BT4 PAE guide:
http://www.backtrack-linux.org/forum...ad.php?t=34809

Now I have a new problem:
ALL usb devices are missing
ALL network devices are missing

I am seeing an error like this "/sbin/modprobe -bv pci:'<followed by some numbers>' unexpected exit with status 0x000b"

but I can see that the 8GB is finally being used! I am so close. This is killing me. Once I get the memory working the system is now 100% useless. Luckily I can still boot in to the older kernel and try again but I'm not sure how to fix this kernel...

Have you ever seen a kernel get borked like this?

[Cypeencurry]

Certainly. I agree with you.

[Devil87]

i I solved this way
this worked for me .NB system installed on the machine and not in live cd not vm (of course)

1.

root@bt:~# prepare-kernel-sources

andare nella directory del kernel nel mio caso 3.2.6
go to the directory of the kernel in my case 3.2.6
2.

root@bt:~# cd /usr/src/linux-source-3.2.6

Bacup .config
3.

root@bt:/usr/src/linux-source-3.2.6# zcat /proc/config.gz > .config

avviare il menu di configurazione

4.

root@bt:/usr/src/linux-source-3.2.6#make menuconfig

Cercare la voce
Search for item
Processor type and features ---> (select)
cercare la voce
Search for item
High Memory Support (4GB) ---> (select)
marcare la voce
mark the entry
(X) 64GB
salvare ed uscire
save and exit
5.

root@bt:/usr/src/linux-source-3.2.6# make

(il processo dura un'ora circa process takes about an hour)
6.

root@bt:/usr/src/linux-source-3.2.6# make modules

7.

root@bt:/usr/src/linux-source-3.2.6# make modules_install

8.

root@bt:/usr/src/linux-source-3.2.6#make scripts

9.

root@bt:/usr/src/linux-source-3.2.6#make prepare

copiare bzImage in vmlinuz-3.2.6
copy bzImage in vmlinuz-3.2.6
10.

root@bt:/usr/src/linux-source-3.2.6# cp /usr/src/linux-source-3.2.6/arch/x86/boot/bzImage /boot/vmlinuz-3.2.6

copiare System.map in System.map-3.2.6
copy System.map in System.map-3.2.6
11. root@bt:/usr/src/linux-source-3.2.6# cp /usr/src/linux-source-3.2.6/System.map /boot/System.map-3.2.6
creare un collegamento simbolico della cartella linux in build
create a symbolic link to the folder in linux build
12.

root@bt:/usr/src/linux-source-3.2.6#ln -s /usr/src/linux /lib/modules/3.2.6/build

creare la nuova immagine initramfs
create a new initramfs image
13.

mkinitramfs -o /boot/initrd.img-3.2.6 3.2.6

aggiornare l'immagine
update the image
14.

root@bt:/usr/src/linux-source-3.2.6# update-initramfs -u

aggiornare grub
update grub
15.

root@bt:/usr/src/linux-source-3.2.6# update-grub

riavviare
reboot
16.

root@bt:/usr/src/linux-source-3.2.6# reboot

spero di averti aiutato e di aiutare tutti quelli che hanno lo stesso problema
I hope I helped and to help all those who have the same problem
I hope that English is good because I have translated from the internet