> But, it did not address my queries regarding XIP(Execute in Place) &
> cost factors.
>
> a) Is there any other specific configuration to look for while
> selecting the Flash Memory while going in for XIP ?
Yes.
Speed!
Any recent microcontroller needs a fast source of code. For XIP, your flash
should have a asychronous or synchronous page mode.
regards
Wolfgang
Reply by karthikbalaguru●November 5, 20072007-11-05
On Oct 25, 11:51 am, Juergen Beisert <jbeis...@netscape.net> wrote:
> Hi,
>
> karthikbalaguru wrote:
> > My Queries are :-
> > 1) But, What is the advantage of Top Boot Flash Memory and
> > What is the advantage of Bottom Boot Flash memory ?
>
> Sometimes these special blocks are smaller than the others. This might be an
> advantage, when you have to store some kind of variable information in it.
> You waste less space in this case (the bootloader u-boot does so. Sometimes
> you must waste 256kiB (one sector), but you only need 3kiB for the real
> data).
>
> > 2) Apart from protection to the Boot Block, what are the other
> > differences between these Boot Block based Flash memories
> > and Normal Flash Memories (Uniform Block Flash Memory)?
>
> AFAIK no other difference.
>
> > 3) Which is cost-effective (Boot Block based Flash or Normal
> > Flash ( Uniform Block Flash Memory) ) ?
>
> Prepare your hardware and software to handle both types. Then you can always
> buy the cheaper one.
>
> > 4) Is the lifetime (Number of programmable / erase cycles)
> > of the Boot Block lesser than or equivalent to that of
> > the Normal Blocks (Application Code, User
> > Parameters and User Data)?
>
> AFAIK no.
>
> > 5) Can that Boot Block area used for other purporses w.r.t
> > security of the application ?
>
> To store data the user can setup at runtime.
>
> > 6) I understand that for systems with small amounts of memory,
> > XIP is very good that each instance of that program uses
> > system RAM, only for their stack, BSS, and data segments
> > while the shared text segment remains in Flash Memory.
>
> > But, Is there any specific Block dedicated for text segment
> > while performing XIP in either Boot Block Flash Memories
> > or Uniform Block Flash Memories(Normal Flash Memories)?
>
> The sizes of the sectors are only important, when you are going to erase
> them (or when you want to run a real filesystem on top of it, like JFFS2).
> When you read this memory type (=run code from it), they are unimportant.
>
Thx for the information provided by you , Norbert van Bolhuis and
others in all
these groups. It has given me some good information .
Karthik Balaguru
Reply by karthikbalaguru●November 5, 20072007-11-05
On Nov 1, 2:16 pm, Norbert van Bolhuis <nvbolhu...@Taimsys.nl> wrote:
> karthikbalaguru wrote:
> > I have the following queries based on the Flash Memory.
>
> > 1) What is the advantage of Top Boot Flash Memory and
> > What is the advantage of Bottom Boot Flash memory ?
>
> > 2) Apart from protection to the Boot Block, what are the other
> > differences between these Boot Block based Flash memories
> > and Normal Flash Memories (Uniform Block Flash Memory)?
>
> > 3) Which is cost-effective (Boot Block based Flash or Normal
> > Flash ( Uniform Block Flash Memory) ) ?
>
> > 4) Is the lifetime (Number of programmable / erase cycles)
> > of the Boot Block lesser than or equivalent to that of
> > the Normal Blocks (Application Code, User
> > Parameters and User Data)?
>
> > 5) Can that Boot Block area used for other purporses w.r.t
> > security of the application ?
>
> > 6) I understand that for systems with small amounts of memory,
> > XIP is very good that each instance of that program uses
> > system RAM, only for their stack, BSS, and data segments
> > while the shared text segment remains in Flash Memory.
>
> > But, Is there any specific Block dedicated for text segment
> > while performing XIP in either Boot Block Flash Memories
> > or Uniform Block Flash Memories(Normal Flash Memories)?
>
> > 7) Is there any other specific configuration to look for while
> > selecting the Flash Memory while going in for XIP ?
>
> > Any ideas / link / pdf ?
>
> > Thx in advans,
> > Karthik Balaguru
>
> Did you already see the "Uniform versus boot block Flash architectures"
> document from STMicroelectronics.
> you can find it here:http://www.st.com/stonline/products/literature/an/7105.pdf
>
That document is very interesting.
Thx for that link/document.
But, it did not address my queries regarding XIP(Execute in Place) &
cost factors.
a) Is there any other specific configuration to look for while
selecting the Flash Memory while going in for XIP ?
b) Is there any specific Block dedicated for performing XIP
in either Boot Block Flash Memories or Uniform Block
Flash Memories(Normal Flash Memories)?
c) Cost factors
Karthik Balaguru
Reply by karthikbg●October 29, 20072007-10-29
On Oct 27, 11:31 pm, Jerry Avins <j...@ieee.org> wrote:
> CBFalconer wrote:
> > donald wrote:
> >> karthikbalaguru wrote:
>
> > ... snip ...
> >>> I posted it 3 days back , but did not get any answers.
> >>> Any problem in the post ?
> >>> Is there any pdf / some links that discusses about these ?
> >> The problem is that you need to do you own home work / research.
>
> >> Gmail account are ingorded here.
>
> > I think he means plonked. In addition, the excessive cross-posting
> > without setting follow-ups is also likely to trigger various
> > blocks.
>
> > The cure - post to one newsgroup, and get a real news-reader.
>
> Is someone confusing gmail with google groups? I see nothing wrong with
> either. I use groups.google.com when I'm away from home, and a gmail
> account isn't fundamentally different from AOL or Yahoo. I think
> Google's spam policies are deplorable and I agree than they're home to
> trolls and the clueless, but son't blame the service for the foibles of
> its users. IIRC, Rune Alnor uses gmail. Whoever ignores him loses much.
>
> karthikbalaguru: I ignored your question because I had no answer. Maybe
> I'm not alone in that.
>
Ok, Thx of that information. :):)
Karthik Balaguru
Reply by karthikbalaguru●October 29, 20072007-10-29
On Oct 27, 11:31 pm, Jerry Avins <j...@ieee.org> wrote:
> CBFalconer wrote:
> > donald wrote:
> >> karthikbalaguru wrote:
>
> > ... snip ...
> >>> I posted it 3 days back , but did not get any answers.
> >>> Any problem in the post ?
> >>> Is there any pdf / some links that discusses about these ?
> >> The problem is that you need to do you own home work / research.
>
> >> Gmail account are ingorded here.
>
> > I think he means plonked. In addition, the excessive cross-posting
> > without setting follow-ups is also likely to trigger various
> > blocks.
>
> > The cure - post to one newsgroup, and get a real news-reader.
>
> Is someone confusing gmail with google groups? I see nothing wrong with
> either. I use groups.google.com when I'm away from home, and a gmail
> account isn't fundamentally different from AOL or Yahoo. I think
> Google's spam policies are deplorable and I agree than they're home to
> trolls and the clueless, but son't blame the service for the foibles of
> its users. IIRC, Rune Alnor uses gmail. Whoever ignores him loses much.
>
> karthikbalaguru: I ignored your question because I had no answer. Maybe
> I'm not alone in that.
>
Ok, Thx for the information . :):)
Karthik Balaguru
Reply by Jerry Avins●October 28, 20072007-10-28
Jerry Avins wrote:
> CBFalconer wrote:
>
> ...
>
>> I was not criticizing him, just pointing out the effects he is
>> causing. He is posting through google groups - see the
>> Organization header.
>
> Many of us do some of the time. McLuhan to the contrary, it's not the
> medium and the message aren't one and the same. the message.
Eh? That's not what I wrote. I wrote
McLuhan to the contrary, the medium and the message aren't one and the
same.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by Jerry Avins●October 28, 20072007-10-28
CBFalconer wrote:
...
> I was not criticizing him, just pointing out the effects he is
> causing. He is posting through google groups - see the
> Organization header.
Many of us do some of the time. McLuhan to the contrary, it's not the
medium and the message aren't one and the same. the message.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by CBFalconer●October 27, 20072007-10-27
Jerry Avins wrote:
> CBFalconer wrote:
>> donald wrote:
>>> karthikbalaguru wrote:
>>>
>> ... snip ...
>>>
>>>> I posted it 3 days back , but did not get any answers.
>>>> Any problem in the post ?
>>>> Is there any pdf / some links that discusses about these ?
>>>
>>> The problem is that you need to do you own home work / research.
>>>
>>> Gmail account are ingorded here.
>>
>> I think he means plonked. In addition, the excessive cross-posting
>> without setting follow-ups is also likely to trigger various
>> blocks.
>>
>> The cure - post to one newsgroup, and get a real news-reader.
>
> Is someone confusing gmail with google groups? I see nothing wrong
> with either. I use groups.google.com when I'm away from home, and
> a gmail account isn't fundamentally different from AOL or Yahoo. I
> think Google's spam policies are deplorable and I agree than
> they're home to trolls and the clueless, but son't blame the
> service for the foibles of its users. IIRC, Rune Alnor uses gmail.
> Whoever ignores him loses much.
I was not criticizing him, just pointing out the effects he is
causing. He is posting through google groups - see the
Organization header.
--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>
--
Posted via a free Usenet account from http://www.teranews.com
Reply by Ali●October 27, 20072007-10-27
On Oct 28, 2:31 am, Jerry Avins <j...@ieee.org> wrote:
> CBFalconer wrote:
> > donald wrote:
> >> karthikbalaguru wrote:
>
> > ... snip ...
> >>> I posted it 3 days back , but did not get any answers.
> >>> Any problem in the post ?
> >>> Is there any pdf / some links that discusses about these ?
> >> The problem is that you need to do you own home work / research.
>
> >> Gmail account are ingorded here.
>
> > I think he means plonked. In addition, the excessive cross-posting
> > without setting follow-ups is also likely to trigger various
> > blocks.
>
> > The cure - post to one newsgroup, and get a real news-reader.
>
> Is someone confusing gmail with google groups? I see nothing wrong with
> either. I use groups.google.com when I'm away from home, and a gmail
> account isn't fundamentally different from AOL or Yahoo. I think
> Google's spam policies are deplorable and I agree than they're home to
> trolls and the clueless, but son't blame the service for the foibles of
> its users. IIRC, Rune Alnor uses gmail. Whoever ignores him loses much.
>
> karthikbalaguru: I ignored your question because I had no answer. Maybe
> I'm not alone in that.
>
> Jerry
> --
> Engineering is the art of making what you want from things you can get.
> =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
> Is someone confusing gmail with google groups? I see nothing wrong with
> either. I use groups.google.com when I'm away from home, and a gmail
> account isn't fundamentally different from AOL or Yahoo.
So do I!
Actually while ago i tried to switch to some _dedicated_ software to
access the usenet (a.k.a news reader). But yoiu know I ened up with
nothing. Because google.groups does provide you lots of goodies that
ANY standard reader is simply unable to provide. Unless you have *
huge storage and enough processing to store and archive the things
that might happen anywhere at anytime.
I'm telling you its super easy to search the discussions and day to
day issuse via google's interface (google groups). Sure, news readers
are fine if you are focusing defined domains and don't have dynamic
areas to explore.
ali
Reply by Jerry Avins●October 27, 20072007-10-27
CBFalconer wrote:
> donald wrote:
>> karthikbalaguru wrote:
>>
> ... snip ...
>>> I posted it 3 days back , but did not get any answers.
>>> Any problem in the post ?
>>> Is there any pdf / some links that discusses about these ?
>> The problem is that you need to do you own home work / research.
>>
>> Gmail account are ingorded here.
>
> I think he means plonked. In addition, the excessive cross-posting
> without setting follow-ups is also likely to trigger various
> blocks.
>
> The cure - post to one newsgroup, and get a real news-reader.
Is someone confusing gmail with google groups? I see nothing wrong with
either. I use groups.google.com when I'm away from home, and a gmail
account isn't fundamentally different from AOL or Yahoo. I think
Google's spam policies are deplorable and I agree than they're home to
trolls and the clueless, but son't blame the service for the foibles of
its users. IIRC, Rune Alnor uses gmail. Whoever ignores him loses much.
karthikbalaguru: I ignored your question because I had no answer. Maybe
I'm not alone in that.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������