I just tried a new Lenny install from scratch on the s390 architecture, with one of the disks pre-formatted in ldl format. (Of course I told the Debian installer not to format it.) When I got to the "partition disks" step, the implicit partition present on that disk was recognized and I was able to assign a mount point to it and complete the install. This makes me optimistic that read-only support for CMS-formatted disks (reserved and non-reserved) in parted may be all that is needed to support CMS-formatted disks in the Debian installer. The installer itself may not need to be changed.
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