From: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Gleb Natapov <gleb@redhat.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
qemu-devel <qemu-devel@nongnu.org>,
Michal Suchanek <hramrach@centrum.cz>,
Kevin O'Connor <kevin@koconnor.net>, Avi Kivity <avi@redhat.com>,
Jordan Justen <jljusten@gmail.com>
Subject: Re: [Qemu-devel] Re: RFC: emulation of system flash
Date: Thu, 10 Mar 2011 22:46:34 +0100 [thread overview]
Message-ID: <4D7946BA.2040704@gmx.net> (raw)
In-Reply-To: <4D78BEB6.6070208@siemens.com>
Auf 10.03.2011 13:06, Jan Kiszka schrieb:
> BTW, the programming granularity is not bytes but chips with common CFI.
> But that's still tricky if you want to run code from the same chip while
> updating parts of it. The easiest workaround would be handling the
> overlay regions as ROM all the time. Not accurate but realizable without
> kernel changes.
>
I've yet to see CFI chips on x86.
>> On Thu, Mar 10, 2011 at 12:27:55PM +0100, Jan Kiszka wrote:
>>
>>> Virtio
>>> means that you have to patch the guest (which might be something else
>>> than flexible Linux...).
>>>
>>>
>> This intended to be used by firmware only and we control that.
>>
> I'm thinking beyond this use case, beyond firmware flashes, beyond x86.
>
If you're thinking beyond x86, most flash is probably using SPI nowadays
because the reduced PCB footprint can save lots of money. And for SPI
you only need OOB access for write and the memory region itself is readonly.
Regards,
Carl-Daniel
--
http://www.hailfinger.org/
next prev parent reply other threads:[~2011-03-10 21:45 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-10 4:51 [Qemu-devel] RFC: emulation of system flash Jordan Justen
2011-03-10 9:10 ` [Qemu-devel] " Avi Kivity
2011-03-10 18:43 ` Jordan Justen
2011-03-10 21:52 ` Carl-Daniel Hailfinger
2011-03-10 22:14 ` Jordan Justen
2011-03-10 22:31 ` Carl-Daniel Hailfinger
2011-03-10 22:58 ` Jordan Justen
2011-03-10 23:41 ` Carl-Daniel Hailfinger
2011-03-11 2:12 ` Jordan Justen
2011-03-10 9:47 ` Gleb Natapov
2011-03-10 11:27 ` Jan Kiszka
2011-03-10 11:46 ` Jan Kiszka
2011-03-10 11:53 ` Paolo Bonzini
2011-03-10 12:07 ` Jan Kiszka
2011-03-10 19:03 ` Jordan Justen
2011-03-10 19:23 ` Anthony Liguori
2011-03-10 20:05 ` Jordan Justen
2011-03-10 11:48 ` Gleb Natapov
2011-03-10 12:06 ` Jan Kiszka
2011-03-10 12:17 ` Gleb Natapov
2011-03-10 12:27 ` Jan Kiszka
2011-03-10 19:08 ` Jordan Justen
2011-03-10 19:13 ` Gleb Natapov
2011-03-10 21:46 ` Carl-Daniel Hailfinger [this message]
2011-03-10 22:11 ` Scott Wood
2011-03-10 21:41 ` Carl-Daniel Hailfinger
2011-03-10 22:05 ` Jordan Justen
2011-03-10 18:59 ` Jordan Justen
2011-03-10 19:12 ` Gleb Natapov
2011-03-10 19:50 ` Jordan Justen
2011-03-10 20:08 ` Антон Кочков
2011-03-10 20:21 ` Gleb Natapov
2011-03-11 21:41 ` Jordan Justen
2011-03-14 14:29 ` Gleb Natapov
2011-03-10 21:37 ` [Qemu-devel] " Carl-Daniel Hailfinger
2011-03-10 21:55 ` Jordan Justen
2011-03-10 22:10 ` Carl-Daniel Hailfinger
2011-03-10 22:29 ` Jordan Justen
2011-03-10 23:53 ` Carl-Daniel Hailfinger
2011-03-11 0:19 ` [Qemu-devel] " Jan Kiszka
2011-03-11 0:27 ` Carl-Daniel Hailfinger
2011-03-11 19:09 ` Jordan Justen
2011-03-11 23:10 ` Michal Suchanek
2011-03-12 9:24 ` Jan Kiszka
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