[SeaBIOS] How much RAM is required?

[Markus Armbruster]

"Fred ." <eldmannen at gmail.com> writes:

> On Fri, Aug 10, 2012 at 5:28 PM, Markus Armbruster <armbru at redhat.com> wrote:
>> Frediano Ziglio <frediano.ziglio at citrix.com> writes:
>>
>>> On Fri, 2012-08-10 at 16:24 +0200, Peter Stuge wrote:
>>>> Fred . wrote:
>>>> > No, I am not.
>>>>
>>>> Ok, so there's only a hypothesis.
>>>>
>>>>
>>>> > But I believe QEMU does have the functionality to load an arbitrary
>>>> > firmware. So the firmware doesn't necessarily have to be SeaBIOS.
>>>>
>>>> As you may know the 8086 reset vector is at 1MB-16 so it will be
>>>> really difficult to run a PC-like machine with less than 1MB of
>>>> memory. I don't believe one has ever existed.
>>>>
>>>
>>> I remember that my manual of the NEC V20 (a 8086 clone with 10 MHZ!) has
>>> settings for 256KB of RAM (jumpers of course!)
>>>
>>> The ROM was "mapped" (physically!) at f0000 with extended ROM at e0000.
>>
>> According to Wikipedia, the original IBM PC was sold with as little as
>> 16KiB RAM.  IIRC, 64KiB BIOS ROM at the top of the 1MiB address space.
>>
>> http://en.wikipedia.org/wiki/IBM_PC
>>
>> [...]

> Some machines also have broken memory modules.
> So some computers have 0 byte RAM in that case. :D

Yup, be we *can* catch that in QEMU :)