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<p>Hi Björn</p>
<p>What do you mean by: "enter the BIOS"? That could be very helpful
for me.</p>
<p>About the memory map:</p>
<p>section 1 is the Boot-ROM (afik)</p>
<p>section 2 is the 192k L2 Memory (The larger memory)</p>
<p>section 3: there should be some 64k of on chip ram somewhere (but
this could also be banked in on section 1 memory range after the
boot rom finished)</p>
<p>Cheers <br>
</p>
<p>sven<br>
</p>
<br>
<div class="moz-cite-prefix">Am 30.12.17 um 22:19 schrieb Bjoern:<br>
</div>
<blockquote type="cite"
cite="mid:cbb81b2b-e8d6-cc61-989b-1480357f2d14@online.de">Hi
Matthias,
<br>
<br>
When I read out the NAND directly by a Raspberry Pi, the data was
not really reliable because some bits always toggled.
<br>
Is your reading method giving accurate, reproducable results or
are toggled bits an inherent effect of reading raw data from NANDs
(hence using ECC is mandatory) or ?
<br>
<br>
I have meanwhile managed to enter the BIOS of the TT. This BIOS
offers the following commands:
<br>
- download
<br>
- setvalue
<br>
- go
<br>
- dump
<br>
<br>
From what I could see so far, only two memory sections contain
data:
<br>
section 1: 0x0000'0000 - 0x0000'FFFF
<br>
section 2: 0x0800'0000 - 0x0802'FFFF
<br>
<br>
Section 1 is almost sure the BIOS itself, about the meaning of
section 2 I have no idea (RAM?).
<br>
If you think it might support you with your efforts, I can
describe the steps for entering the BIOS mode more in detail.
<br>
<br>
Cheers
<br>
Björn
<br>
<br>
<br>
<br>
Am 30.12.2017 um 18:22 schrieb Matthias Weber:
<br>
<blockquote type="cite">Hi Werner and list,
<br>
<br>
up to my current knowledge, nobody is able to perform a firmware
update
<br>
of the pen. If I'm wrong, I'd be happy to read how it is done.
<br>
<br>
So far we've taken a dump of a tiptoi pen's flash memory and are
trying
<br>
to find out how the firmware update is done or how we can get a
<br>
workaround to flash new firmware.
<br>
<br>
It will be helpful to understand the memory mapping of the
peripherals
<br>
connected to/ used by the ARM core (UART, flash interfaces).
That's what
<br>
Sven has started to work on. We'd be happy to get any support
here.
<br>
<br>
Cheers,
<br>
Matthias
<br>
<br>
<br>
Werner Beroux wrote:
<br>
<blockquote type="cite">I updated the
<br>
bug <a class="moz-txt-link-freetext" href="https://github.com/entropia/tip-toi-reveng/issues/171">https://github.com/entropia/tip-toi-reveng/issues/171</a> as I
kind of
<br>
bricked my Tiptoi. Wondering if you had some known way to
unbrick the
<br>
device, flash it, or change language on a working device?
<br>
<br>
</blockquote>
</blockquote>
<br>
<br>
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