[PATCH] powerpc/powernv: Turn on SCSI_AACRAID in powernv_defconfig

Michael Ellerman mpe at ellerman.id.au
Tue Aug 29 21:22:12 AEST 2017

"Guilherme G. Piccoli" <gpiccoli at linux.vnet.ibm.com> writes:

> On 08/28/2017 02:56 AM, Michael Ellerman wrote:
>> Some Power9 boxes will have this adapter installed, so add it to the
>> defconfig so we can boot on those machines without an initrd.
> Michael, not sure if this affects Petitboot (I know it has its own
> default config files), but in the past we had some issues with this
> driver and it's nice to have the possibility to blacklist it.

Why we were black listing it?

> What is the rationale for this change? I mean, how being able to boot
> without initrd is interesting here? Sorry if it's silly question!

It is a silly question! :)

When you boot as many kernels as me it's preferable to be able to build
a kernel completely remote from the box, throw the kernel on a tftp
server and have the machine boot from that kernel all the way to

That requires not using an initrd, and therefore having all the drivers
built-in that are needed to get to the boot disk.

(Yeah it is "possible" to build an initrd remotely but it's a pain).

And the one P9 box I have here uses that driver for its root disk, so I
do really want it to be =y.


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