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MPC5125 unexpected reset (new erratum?)

Question asked by a p on Feb 12, 2015

My Freescale TWR-MPC5125 board instantly reboots if I touch any physical address on the LocalPlus Bus (LPB) with disabled NFC clock.

 

I've reproduced TWR-MPC5125 simply in uboot.

This is the annotated procedure:

 

=> md.l 0x80000e10  /* Reset Status Register */

80000e10: 60000000  /* All flags are cleared (just powered on) */

 

=> md.l 0x80000f04  /* System Clock Control Register 1 */

80000f04: e404b600  /* NFC clock is enabled */

 

=> md.l 0xfff00000  /* Reading from MRAM living at LPB CS0 */

fff00000: cafea134  /* Works fine */

 

=> mw.l 0x80000f04 0xc404b600 1 /* Disable NFC clock */

 

=> md.l 0x80000f04

80000f04: c404b600  /* NFC clock is disabled now */

 

=> md.l 0xfff00000  /* Reading from MRAM again */

fff00000:

 

/* The board has just suddenly reset. Uboot is restarting. */

 

U-Boot 2009.03-00004-gd37ab38 (Apr 14 2010 - 10:48:22) MPC512X

CPU:   MPC5125 rev. 1.0, Core e300c4 at 393.216 MHz, CSB at 196.608 MHz

...

 

=> md.l 0x80000e10  /* Read RSR */

80000e10: 60000040  /* Only external HRESET1 event has occurred */

 

Rising of EXT1HRS flag is not special for this crash.

EXT1HRS is similarly set if I execute 'reset' command in uboot

or call 'reboot' from Linux.

 

Did I find some new errata?

 

Best regards,

Alexander

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