[ipxe-devel] SRP booting linux, SRP volume with ISO stops seeing itself

Michael Brown mcb30 at ipxe.org
Thu Jan 28 00:17:24 UTC 2016

On 08/01/16 02:19, james harvey wrote:
> Before I keep going down the hole, let me make sure my plan isn't
> futile.  I want to make a diskless system, by having iPXE in my
> InfiniBand card's ROM, and being able to boot an Arch Linux Live ISO
> (custom built with srp kernel modules) exported as a SRP volume backed
> by the ISO, and install on other SRP volumes which are backed by LVM
> volumes.
> I have a real general idea of how the iPXE to kernel handoff works,
> through the iBFT (iSCSI Boot Firmware Table.)  Since I'm using SRP
> rather than iSCSI, is the iBFT still used?  If not, how does the SRP
> connection get handed off, with all the variables needed for an SRP
> connection?

There is an SRP boot firmware table constructed (the sBFT).  This is 
nominally documented at


However, I'm not aware of any Linux userspace tools that are capable of 
parsing that structure.  It should be fairly easy to create such a tool, 
which would scan base memory for the sBFT signature, verify the 
checksum, extract the fields, and then write the relevant values into 
sysfs to initiate the connection.

I thought I had written such a tool back in 2009, but all I can find 
relating to it is the proposal document.  It seems to have been an 
abandoned project back then.


More information about the ipxe-devel mailing list