Hello Richard
Am 19.10.2015 um 23:48 schrieb Richard Weinberger:
Am 19.10.2015 um 23:40 schrieb Ezequiel Garcia:
On 19 October 2015 at 17:22, Richard Weinberger <rich...@nod.at> wrote:
Am 19.10.2015 um 15:47 schrieb Ezequiel Garcia:
After some further investigation, printing the counters as Richard suggested
I found it was a bug on my side :-( The Linux partition and the U-Boot partition
had different size (i.e. PEB count) and so Fastmap complained :-(
We trimmed the Linux partition size, and forgot to change U-Boot's
(or thought it wouldn't matter).
Sorry for the noise guys!
Good to know. :)
Let me find a way to detect and report this kind of user error
better.
The WARN_ON() is only meant for bad internal errors.
Sure. In case it's not clear, let me clarify what the issue was: the
MTD partition
has one size in Linux (4072 EB) and another size in U-Boot (4076 EB).
When the map was built by Linux's Fastmap, it contained a number of PEBs that
conflicted with the number of PEBs U-Boot's Fastmap code was expecting
(becase Linux EB != U-Boot EB).
Not sure how you would detect such a mismatch, but it was a very good
idea to print a noisy warning :-)
I think it would make sense to drop the WARN_ON() and replace it to a
warning using ubi_err() which explains what possible went wrong.
i.e. MTD partition layout mismatch, an internal error, etc...
Yep.
We were effectively running without fastmap so far, becasue neither U-Boot
nor Linux could find a proper fastmap and attach the UBI partition using it.
Yeah, U-Boot's fast decided to fall back to scanning mode and had to drop the
existing fastmap and therefore Linux also had to do a full scan too.
Didn;t got this, why is fastmap not working in U-Boot?
On the aristainetos2 board, I use fastmap, see:
http://xeidos.ddns.net/buildbot/builders/ari_ubi/builds/7/steps/shell/logs/tbotlog
search for "attached by fastmap" ...
nand 1024MiB:
05:02:32,905:INFO :tbotlib # write 1: ubi part ubi 4096
[...]
05:02:34,289:INFO :tbotlib # read 1: ubi0: attached by fastmap
[...]
05:02:34,529:INFO :tbotlib # read 1: ubi0: available PEBs: 3877, total reserved PEBs: 207, PEBs
reserved for bad PEB handling: 68
1024MiB ubi artition attached in 0.624 s ...
SPI Nor flash:
05:03:14,380:INFO :tbotlib # write 1: ubi part rescue-system 64
[...]
05:03:16,010:INFO :tbotlib # read 1: ubi0: attached by fastmap
[...]
05:03:16,215:INFO :tbotlib # read 1: ubi0: available PEBs: 10, total reserved PEBs: 231, PEBs
reserved for bad PEB handling: 0
15MiB Nor UBI partition in ~2 s ...
bye,
Heiko
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