libqmi-devel Digest, Vol 77, Issue 3

[Aleksander Morgado]

Hey,

On Mon, Jan 14, 2019 at 4:03 PM Paul Gildea <gildeap at tcd.ie> wrote:

> This report is from quite some time ago but as I hit this issue when
> working with libqmi recently, maybe some of my debugging can help anybody
> else if they get this issue. In my case the upgrade is failing whenever I
> am using a slow baud rate. Each time I tried to upgrade an MC7455 with a
> connection using baud 9600 I would get this error. On a hunch I thought
> that this may be related to the issue. I redirected the upgrade output to a
> file and the upgrade worked fine, I sshed in and that worked fine also.
>

You mean the actual stdout of qmi-firmware-update is maybe too much if your
connection is very slow? i.e. 9600bps is your remote connection to a system
with the MC7455, right?



>
>
> Another issue I noticed is that when upgrading is complete and the updater
> is waiting on a reply using the cdc-wdm port, if the higher enumerated of
> the two ports is used, the transactions will time out. For instance if the
> modem comes back up with cdc-wdm0 and cdc-wdm1 then if cdc-wdm1 is used
> this will happen 12 times and then the program will print an error also
> (seen below):
>
> [14 Jan 2019, 14:34:43] [Debug] [/dev/cdc-wdm1] sent generic request
> (translated)...
> <<<<<< QMUX:
> <<<<<<   length  = 11
> <<<<<<   flags   = 0x00
> <<<<<<   service = "ctl"
> <<<<<<   client  = 0
> <<<<<< QMI:
> <<<<<<   flags       = "none"
> <<<<<<   transaction = 1
> <<<<<<   tlv_length  = 0
> <<<<<<   message     = "Sync" (0x0027)
>
> [14 Jan 2019, 14:35:03] -Warning ** couldn't create DMS client after
> upgrade: couldn't open QMI device: Transaction timed out
> [14 Jan 2019, 14:35:03] -Error ** qmi_device_release_client: assertion
> `QMI_IS_DEVICE (self)' failed
>
> No functional error, the modem upgrades successfully, it just errors and
> never returns to the linux prompt without user intervention. The lower
> enumerated port works fine.
>
>
Does the cdc-wdm1 work at all using QMI after the upgrade? i.e. do you get
2 working QMI ports after the upgrade or just cdc-wdm0 working?

-- 
Aleksander
https://aleksander.es
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