[Bug 1592990] s390-tools-zipl-fix-failed-start-subchannel-in-FBA-loader.patch

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** Attachment added: "s390-tools-zipl-fix-failed-start-subchannel-in-FBA-loader.patch"
   https://bugs.launchpad.net/bugs/1592990/+attachment/4712289/+files/s390-tools-zipl-fix-failed-start-subchannel-in-FBA-loader.patch

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https://bugs.launchpad.net/bugs/1592990

Title:
  HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000
  00004502

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in debian-installer package in Ubuntu:
  Fix Released
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools source package in Xenial:
  Fix Released

Bug description:
  zVM v6.3 zBC12 V7000 FICON SAN048B

  Installed Ubuntu on zBC12 with FICON attached (via SAN048B switches)
  using instructions at
  https://wiki.ubuntu.com/S390X/Installation%20In%20zVM.

  Installation build completed OK but IPL fails (after initial boot options appear and timeout to default) with following error message:
  HCPGIR450W CP entered; disabled wait PSW 00020000 80000000 00000000 00004502

  A trace was taken using:

  #CP TR SSCH RUN
  #CP IPL <ipldev>
  #cp tr end

  The resulting trace appears to fail at the same point in the trace on every IPL.
  Several builds have been attempted on different VMs with identical symptoms.

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