Speculation: z/VM 7.0 should include an ESA/390 early IPL module for z/13 and earlier CPUs that switches to 64 bit mode then continues with normal IPL. This module won't run on z/14+, or it runs and the failure triggers the 64 bit mode IPL.
On Wed, Feb 10, 2016 at 11:28 AM, Joel C. Ewing <[email protected]> wrote: > I see those statements of direction as saying that the version of z/VM > that will IPL under a z14 directly or under a z/VM running on z14 will > not include z/VM 6.3. It says z/VM 6.3 requires ESA/390 mode which will > no longer be supported by processors after z13, but as literally written > it doesn't exclude the possibility that a future z/VM might still > provide the appearance of older ESA/390 support (like IPL in 31-bit > mode) for some virtual machines that might enable running a 31-bit Linux. > > I have no idea whether IBM meant to exclude that possibility, whether > follow-up versions of z/VM will allow for that support, or if there is > even a good argument for allowing it; but the strict wording of the > statements of direction that I have read so far don't seem to rule out > that possibility. > Joel C. Ewing > > On 02/10/2016 10:05 AM, Mike Schwab wrote: >> http://www.vm.ibm.com/zvm630/zvm63sum.html >> >> On Wed, Feb 10, 2016 at 10:03 AM, Mike Schwab <[email protected]> >> wrote: >>> On a z14, you won't be able to run OS 2.9 or earlier, or 31 bit Linux. >>> Not even under z/VM. >>> >>> On Wed, Feb 10, 2016 at 9:30 AM, Joel C. Ewing <[email protected]> wrote: >>>> Clarification appreciated. >>>> >>>> So writing "z13/ 2018 (last IPL-in-31-bit-mode CPU)" could have >>>> eliminated much source of confusion, and by implication indicate that a >>>> 31-bit Linux, the only 31-bit operating system directly supported in a >>>> z13 LPAR, could at that point only be IPLed under z/VM. Any users of >>>> 31-bit Linux would either have to run z/VM or convert to a 64-bit Linux >>>> in order to migrate beyond a z13.. >>>> Joel C. Ewing >>>> >>>> On 02/10/2016 08:51 AM, Mike Schwab wrote: >>>>> IBM Statement of direction: z13 will be the last processor that IPLs >>>>> in 31 bit mode. z14 will IPL in 64 bit mode. >>>>> >>>>> On Wed, Feb 10, 2016 at 5:14 AM, R.S. <[email protected]> >>>>> wrote: >>>>>> W dniu 2016-02-09 o 21:03, Mike Schwab pisze: >>>>>>> Last orderable in Summer: z900/ 2006, z990/ 2008, z9/ 2010, z10/2012, >>>>>>> z196/2014. >>>>>>> Estimating in Summer z12/ 2016, z13/ 2018 (last 31 bit mode cpu), z14/ >>>>>>> 2020. >>>>>> What is "last 31 bit mode cpu" ??? >>>>>> AFAIK last 31 bit machine was 9672 G6, but 31 bit mode programs are still >>>>>> supported as well as 24 bit programs (trimodal architecture). >>>>>> >>>>>> -- >>>>>> Radoslaw Skorupka >>>>>> Lodz, Poland >>>>>> ... >>>>>> Joel C. Ewing, Bentonville, AR [email protected] >>> >>> -- >>> Mike A Schwab, Springfield IL USA >>> Where do Forest Rangers go to get away from it all? >> >> > > > -- > Joel C. Ewing, Bentonville, AR [email protected] > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
