netdev - [how to] modify initrd.img from RHEL6.5

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Message-ID: <B48049383861234BA9F90C37DCBC24F92240AFD9@IRSMSX104.ger.corp.intel.com>
Date:	Thu, 8 May 2014 10:32:34 +0000
From:	"Wisniewski, Krzysztof" <krzysztof.wisniewski@...el.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [how to] modify initrd.img from RHEL6.5_tftpboot to include i40e
 module

Resending in plain text, sorry, krzysztof

From: Wisniewski, Krzysztof 
Sent: Thursday, May 08, 2014 12:19 PM
To: 'e1000-devel@...ts.sourceforge.net'; 'netdev@...r.kernel.org'
Cc: Kepczynski, Tomasz; Gafka, Aleksander; Morgan, Jack; Lawton, Shanon R; Ronciak, John; Kulkarni, Suyog D; Wallace, Andrew; Ciesielski, Dariusz K
Subject: [how to] modify initrd.img from RHEL6.5_tftpboot to include i40e module

Hi,
Looking for help with RHEL 6.5 initrd.img modification to include i40e module for 40G adapter to perform legacy PXE boot on it.

What I try to acomplish: 40G PXE boot of RHEL 6.5 on 40G NIC with PCI ID x1572.

What I do:
-install RHEL 6.5 with kernel 2.6.32-431.el6.x86_64, retrieve tftpboot initrd.img and make o copy of it in /tmp
-build i40e module and test that it works correctly
-exctract the content of initrd.img in /tmp with xz and cpio ->
                mv initrd.img initrd.img.xz
                xz -d -F lzma initrd.img.xz
                mkdir initrd
                cd initrd-new
                cpio -ivdum < ../initrd.img
-add i40e module into initrd ->
                copy i40e.ko into /tmp/initrd/modules/2.6.32-431.el6.x86_64/kernel/drivers/net/i40e/
                gzip i40e.ko
                modify files: module-info, modules.alias, modules.dep, modules.networking, modules.pcimap
                run: depmod -b initrd -a and verify with: modinfo -b initrd i40e
-build initrd into initrd.img ->
                find . -print |cpio -o -H newc | xz -F lzma > ../initrd.img
-copy generated initrd.img into PXE linux server into tftpboot data
-reboot platform, select PXE boot on 40G NIC and RHEL 6.5 tftpboot initrd.img is loaded and fails to find 40G networking interface...
with info as in attached file: module i40e not found.....

I would appreciate any hints or links on how to incorporate i40e module into tftpboot initrd.img in RHEL6 ?
Thanks a lot, regards, krzysztof wisniewski
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