[OpenPower-Firmware] [PATCH] skiroot_defconfig: Remove VirtIO and Solarflare

[Klaus Heinrich Kiwi]

On 12/8/2020 12:02 AM, Joel Stanley wrote:
> On Mon, 7 Dec 2020 at 20:28, Klaus Heinrich Kiwi
> <klaus at linux.vnet.ibm.com> wrote:
>>
>> Remove drivers that apparently are not being used:
>>    * Solarflare
>>    * VirtIO-related drivers
> 
> nak, virtio is used for testing in qemu.
> 
Good point - although perhaps we could use e1000 and megasas without any practical drawbacks?

At any rate, I'm looking for alternatives to keep our zImage.epapr (with bundled rootfs)
under 16MB - it is looking like this is desirable for maintaining compatibility with
AIX / IBM i "lids" constructs that have this as an upper limit.

Looking for things that we might not care about on Skiroot (anymore) plus the fact that
retired Power8 support, some thoughts are:

   
   * Chelsio T3 and T4 and QLogic NetXtreme II iSCSI support - not aware of anyone shipping,
     or even using this. Not having hardware offloading for iscsi sounds hardly a blocker for
     a bootloader, but I couldn't even find the iscsi initiator userland configured.. so not
     sure why we have this enabled?
   * Alteon AceNIC/3Com 3C985/NetGear GA620 Gigabit support - mac G3 era legacy? Couldn't
     find why we ever needed this on OpenPower
   * QLogic bnx2 & CNIC support - looks like tg3 and bnx2x have been the norm lately
   * Myricom Myri-10G - not aware of anyone using it
   * Neterion (Exar) Xframe 10Gb - same

Other non-kernel choices might be:
   * rsync - some 500KB shaved
   * lrsz - 90kb
   * netcat - 80kb

I wonder if we could live by without them. If we want to be under 16MB, we need to be a tad
aggressive with those choices right now..
  

>>   CONFIG_EXT4_FS_POSIX_ACL=y
>> @@ -322,4 +316,5 @@ CONFIG_DEBUG_CREDENTIALS=y
>>   # CONFIG_FTRACE is not set
>>   # CONFIG_RUNTIME_TESTING_MENU is not set
>>   CONFIG_BUG_ON_DATA_CORRUPTION=y
>> +CONFIG_PPC_DISABLE_WERROR=y
> 
> This is unrelated.
> 

Missed that, thanks
  -Klaus
-- 
Klaus Heinrich Kiwi <klaus at linux.vnet.ibm.com>