mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-15 01:17:39 +00:00
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2010
|
|
* Reinhard Meyer, reinhard.meyer@emk-elektronik.de
|
|
*
|
|
* General Purpose Backup Registers
|
|
* Based on AT91SAM9XE datasheet
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef AT91_GPBR_H
|
|
#define AT91_GPBR_H
|
|
|
|
/*
|
|
* The Atmel AT91SAM9 series has a small resource of 4 nonvolatile
|
|
* 32 Bit registers (buffered by the Vbu power).
|
|
*
|
|
* Please consider carefully before using this resource for tasks
|
|
* that do not really need nonvolatile registers. Maybe you can
|
|
* store information in EEPROM or FLASH instead.
|
|
*
|
|
* However, if you use a GPBR please document its use here and
|
|
* reference the define in your code!
|
|
*
|
|
* known typical uses of the GPBRs:
|
|
* GPBR[0]: offset for RTT timekeeping (u-boot, kernel)
|
|
* GPBR[1]: unused
|
|
* GPBR[2]: unused
|
|
* GPBR[3]: bootcount (u-boot)
|
|
*/
|
|
#define AT91_GPBR_INDEX_TIMEOFF 0
|
|
#define AT91_GPBR_INDEX_BOOTCOUNT 3
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
typedef struct at91_gpbr {
|
|
u32 reg[4];
|
|
} at91_gpbr_t;
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif
|