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

Revision as of 14:35, 14 February 2016

RTC

RTC time and date is not maintained when unit is unplugged from power supply, even if an RTC backup battery is installed.

Fixed in U-Boot v2016.01-cm-t43-1

OPP

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.

Fixed in U-Boot v2016.01-cm-t43-1

@@ Line 1: / Line 1: @@
 {{IssueCategory|RTC|
-* RTC time and date is not maintained when unit is unplugged from power supply, even if an RTC backup battery is installed
+* RTC time and date is not maintained when unit is unplugged from power supply, even if an RTC backup battery is installed.
-:'''Workaround:'''
+:'''Fixed in U-Boot v2016.01-cm-t43-1'''
-: 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>
-: This sets the FSEAL bit, which forces the power supply for the RTC to stay on when the system is in the OFF state.
-: Once set it will stay set until the battery is removed or the above commands are run again.
-: More information on this bit can be found in section 8.5.2 of the TPS65218 manual.
 }}
 {{IssueCategory|OPP|
 * 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.
-:'''Workaround:'''
+:'''Fixed in U-Boot v2016.01-cm-t43-1'''
-: Switch to performance governor (default governor) before initiating resets.
 }}
 [[Category:Linux]]
 [[Category:CM-T43]]