On 06/06/2015 08:03 AM, Unembossed Name wrote:
Information below was given by a hardware vendor, who uses these
demodulators on their dvb-t2 products. As an explanation on our
questions for Si2168 Linux driver development.
I think it can give more clue with Part, Revision and ROM detection
algorithm in Linux driver for that demodulator.
Also, I would like to suggest a following naming method for files
containing firmware patches. It's self explaining:
dvb-demod-si2168-a30-rom3_0_2-patch-build3_0_20.fw
dvb-demod-si2168-b40-rom4_0_2-patch-build4_0_19.fw.tar.gz
dvb-demod-si2168-b40-rom4_0_2-startup-without-patch-stub.fw
There is very little idea to add firmware version number to name as then
you cannot update firmware without driver update. Also, it is not
possible to change names as it is regression after kernel update.
(Stub code to startup B40 without patch at all:
0x05,0x00,0x00,0x00,0x00,0x00,0x00,0x00)
I think such naming scheme can help to avoid possible mess with fw patch
versions.
Current driver selects firmware by reading chip revision (A, B) and
PMAJOR/PMINOR, which means A20, A30 and B40 are detected.
PBUILD is 2 and ROMID is 1 for me Si2168-B40 chip, without firmware
upgrade it boots up with fw version 4.0.2. Those numbers are just same
than PMAJOR.PMINOR.PBUILD, but are those?
It is not clear at all what the hell is role of ROMID.
I know that there is many firmware updates available and all are not
compatible with chip revisions. But I expect it is only waste of some
time when upload always biggest firmware to chip.
Lets say there is old B40 having 4.0.2 on ROM. Then there is newer B40
having 4.0.10 on ROM. Then there is firmware upgrade to 4.0.11, one for
4.0.2 and another for 4.0.10. 4.0.2 is significant bigger and as 4.0.10
very close to 4.0.11 it is significantly smaller. However, you could
download that 4.0.2 => 4.0.11 upgrade to both chips and it leads same,
but chip with 4.0.2 fw on ROM will not work if you upload 4.0.10 =>
4.0.11 upgrade. I haven't tested that theory, but currently driver does
that as there is no any other detection than A20/A30/B40 and it seems to
work pretty well. Downside is just that large fw update done always.
regards
Antti
--
http://palosaari.fi/
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