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45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* Copyright (C) 2010
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* Reinhard Meyer, reinhard.meyer@emk-elektronik.de
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*
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* General Purpose Backup Registers
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* Based on AT91SAM9XE datasheet
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef AT91_GPBR_H
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#define AT91_GPBR_H
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/*
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* The Atmel AT91SAM9 series has a small resource of 4 nonvolatile
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* 32 Bit registers (buffered by the Vbu power).
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*
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* Please consider carefully before using this resource for tasks
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* that do not really need nonvolatile registers. Maybe you can
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* store information in EEPROM or FLASH instead.
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*
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* However, if you use a GPBR please document its use here and
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* reference the define in your code!
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*
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* known typical uses of the GPBRs:
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* GPBR[0]: offset for RTT timekeeping (u-boot, kernel)
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* GPBR[1]: unused
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* GPBR[2]: unused
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* GPBR[3]: bootcount (u-boot)
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*/
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#define AT91_GPBR_INDEX_TIMEOFF 0
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#define AT91_GPBR_INDEX_BOOTCOUNT 3
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#ifndef __ASSEMBLY__
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typedef struct at91_gpbr {
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u32 reg[4];
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} at91_gpbr_t;
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#endif /* __ASSEMBLY__ */
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#endif
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