Difference between revisions of "CM-T43: Linux: Known Issues"

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{{IssueCategory|RTC|
 
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* RTC time and date is not maintained when unit is unplugged from power supply, even if an RTC backup battery is installed
 
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:'''Workaround:'''
 
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: Use the following U-Boot commands to enable battery supplied time keeping: <pre>pmic TPS65218_PMIC write 10 b1; pmic TPS65218_PMIC write 10 fe; pmic TPS65218_PMIC write 10 a3</pre>
 
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: This sets the FSEAL bit, which forces the power supply for the RTC to stay on when the system is in the OFF state.
 
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: Once set it will stay set until the battery is removed or the above commands are run again.
 
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: More information on this bit can be found in section 8.5.2 of the TPS65218 manual.
 
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}}
 
  
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{{IssueCategory|OPP|
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{{IssueCategory|Package Manager|
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* U-Boot versions 0.97 and below do not modify the PMIC voltages. The PMIC retains its settings between resets, and as a result if CM-T43 is switched to a low performance OPP (below 800 Mhz), on reset U-Boot will be using low performance voltage settings for a high performance CPU frequency and may not finish booting.
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* Public key problem is reported while retrieving new lists of packages:
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:'''Workaround:'''
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<pre>
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: Switch to performance governor (default governor) before initiating resets.
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root@cm-debian:~# apt-get update
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Get:1 http://ftp.debian.org jessie Release.gpg [2390 B]
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Get:2 http://ftp.debian.org jessie Release [168 kB]
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...
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Fetched 16.0 MB in 24s (662 kB/s)                                                                                                                                         
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Reading package lists... Done
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W: There is no public key available for the following key IDs:
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7638D0442B90D010
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</pre>
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:'''Solution :''' Install ''debian-keyring'' and ''debian-archive-keyring'' packages.
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: '''Note :''' This operation requires ~50MB of additional disk space.
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<pre>
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root@cm-debian:~# apt-get install debian-keyring debian-archive-keyring
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</pre>
 
}}
 
}}
  
 
[[Category:Linux]]
 
[[Category:Linux]]
 
[[Category:CM-T43]]
 
[[Category:CM-T43]]

Latest revision as of 08:27, 29 June 2016

Package Manager
  • Public key problem is reported while retrieving new lists of packages:
root@cm-debian:~# apt-get update
Get:1 http://ftp.debian.org jessie Release.gpg [2390 B]
Get:2 http://ftp.debian.org jessie Release [168 kB]
...
Fetched 16.0 MB in 24s (662 kB/s)                                                                                                                                          
Reading package lists... Done
W: There is no public key available for the following key IDs:
7638D0442B90D010
Solution : Install debian-keyring and debian-archive-keyring packages.
Note : This operation requires ~50MB of additional disk space.
root@cm-debian:~# apt-get install debian-keyring debian-archive-keyring
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