Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

"H. Peter Anvin" <[email protected]> writes:

> Eric W. Biederman wrote:
>>
>> - I know of one system that had BIOS tables at 16MB I believe (and
>>   thus had a fairly low hole).
>>
>
> Please name names, otherwise this is just rumouring.  Seriously.  We have enough
> cargo-cult programming as it is.

The unisys systems.  I don't remember exactly where they put there ACPI
tables but it was low enough that the default address for the kdump kernels
conflicted with it.  So this is likely 16MB or 32MB

> A lot of old ISA systems had an option to put a memory hole at 15-16 MB to
> support ISA video cards with linear frame buffer.  It very rarely got used,
> since VLB took over around the same time.

No this was a much larger and more modern system.

Eric
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---

• References:
  • [PATCH 00/28] Updates for firstfloor paravirt-ops patches
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Chuck Ebbert <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: "H. Peter Anvin" <[email protected]>

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