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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1614309

Title:
  Ubuntu16.10:installation fails on Brazos system (31TB and 192 cores)
  No memory for flatten_device_tree (no room)

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  == Comment: #0 - Praveen K. Pandey - 2016-07-16 10:00:52 ==
  Hi , 

    I tried  ubuntu16.10 Installation in brazos (configuration 31TB memory and 192 cores) system . installation failing during prom_init when trying to allocate flatten_dt memory) System F/w is 
  FW860.00 (TC860_020).

  Reproducible Step :

  1- Configure Power VM  system having profile with  31TB memory and 1 92 Core
  2- Start Ubuntu16.10  Installation 

  Actual Result :

  Installation drop in F/w Console as failing during prom_init

  Expected Result :

  Installation Should went through

  Log:

   Booting a command list

  OF stdout device is: /vdevice/vty@xxxxxxxxxxxxxxxx  34.84MiB  100%  3.01MiB/s ]
  Preparing to boot Linux version 4.4.0-30-generic (buildd@bos01-ppc64el-023) (gcc version 5.3.1 20160413 (Ubuntu/IBM 5.3.1-14ubuntu2.1) ) #49-Ubuntu SMP Fri Jul 1 10:00:36 UTC 2016 (Ubuntu 4.4.0-30.49-generic 4.4.13)
  Detected machine type: 0000000000000101
  Max number of cores passed to firmware: 256 (NR_CPUS = 2048)
  Calling ibm,client-architecture-support... done
  command line: BOOT_IMAGE=/ubuntu-installer/ppc64el/yakkety/vmlinux tasks=standard pkgsel/language-pack-patterns= pkgsel/install-language-support=false DEBIAN_FRONTEND=text locale=en_US priority=low console-setup/ask_detect=false console-setup/layoutcode=us netcfg/disable_dhcp=true netcfg/confirm_static=true netcfg/choose_interface=6c:ae:8b:6a:81:98 netcfg/get_ipaddress=9.40.193.34/24 netcfg/get_gateway=9.40.193.1 netcfg/get_nameservers=9.3.1.200 netcfg/get_hostname=ltc-brazos1.aus.stglabs.ibm.com suite=yakkety scsi_mod.scan=sync sshd netcfg/get_domain=aus.stglabs.ibm.com unrestricted= url=tftp://9.3.80.16/tftpboot/ubuntu-installer/ppc64el/ubuntu-server.seed-01-6c-ae-8b-6a-81-98 anna/choose_modules=network-console network-console/start=continue network-console/password=passw0rd network-console/password-again=passw0rd
  memory layout at init:
    memory_limit : 0000000000000000 (16 MB aligned)
    alloc_bottom : 000000000e3e0000
    alloc_top    : 0000000010000000
    alloc_top_hi : 0000000010000000
    rmo_top      : 0000000010000000
    ram_top      : 0000000010000000
  instantiating rtas at 0x000000000e9e0000... done
  prom_hold_cpus: skipped
  copying OF device tree...
  Building dt strings...
  Building dt structure...
  No memory for flatten_device_tree (no room)
  EXIT called ok
  0 > 

  
  Regards
  Praveen

  == Comment: #8 - Sukadev Bhattiprolu  - 2016-08-05 02:27:07 ==
  Posted a couple of patches to the community for review: 

  http://marc.info/?l=linux-kernel&m=147037748624043&w=2
  http://marc.info/?l=linux-kernel&m=147037768124064&w=2 

  == Comment: #12 - Sukadev Bhattiprolu - 2016-08-17 19:23:22 ==

  Temporary fix to address the issue while the above patches are being
  reviewed.

  ==

  Canonical,

  Please add the attached temporary fix to 16.10 to address the
  following issue while the upstream changes are being considered.

     When booting a very large system with a large initrd we run out of space
     for the flattened device tree (FDT). To fix this we must increase the
     space allocated for the RMA region.

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