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On Thu, May 9, 2013 at 10:28 PM, Julius Hemanth P <[email protected]> wrote: > This code is small snippet from patch > ftp://ftp.linux4sam.org/pub/uboot/u-boot-v2010.06/u-boot-5series_1.0.patch > > Linux 2.6.39 (released on www.at91.com/linux4sam) requires serial and > revision ATAGs to detect NAND device. > > This patch provides backward compatibility for old Linux 2.6.39 by > passing serial and revision ATAGs to Linux kernel. > > Signed-off-by: Julius Hemanth <[email protected]> > --- > Changes for v3: > - corrected GPBR register access > - updated commit message > > Changes for v2: > - access GPBR using c structure > - removed tailing 1 for #define > - s/Miscelaneous/Miscellaneous > - s/initialisations/initializations > > board/atmel/at91sam9x5ek/at91sam9x5ek.c | 33 ++++++++++++++++++++++++++++++++- > include/configs/at91sam9x5ek.h | 5 +++++ > 2 files changed, 37 insertions(+), 1 deletion(-) > > diff --git a/board/atmel/at91sam9x5ek/at91sam9x5ek.c > b/board/atmel/at91sam9x5ek/at91sam9x5ek.c > index 8773e6f..116bd83 100644 > --- a/board/atmel/at91sam9x5ek/at91sam9x5ek.c > +++ b/board/atmel/at91sam9x5ek/at91sam9x5ek.c > @@ -27,6 +27,7 @@ > #include <asm/arch/at91_common.h> > #include <asm/arch/at91_pmc.h> > #include <asm/arch/at91_rstc.h> > +#include <asm/arch/at91_gpbr.h> > #include <asm/arch/gpio.h> > #include <asm/arch/clk.h> > #include <lcd.h> > @@ -48,8 +49,34 @@ DECLARE_GLOBAL_DATA_PTR; > > /* ------------------------------------------------------------------------- > */ > /* > - * Miscelaneous platform dependent initialisations > + * Miscellaneous platform dependent initializations > */ > + > +#ifdef CONFIG_LOAD_ONE_WIRE_INFO > +static u32 system_rev; > +static u32 system_serial_low; > + > +u32 get_board_rev(void) > +{ > + return system_rev; > +} > + > +void get_board_serial(struct tag_serialnr *serialnr) > +{ > + serialnr->high = 0; /* Not used */ > + serialnr->low = system_serial_low; > +} > + > +void load_1wire_info(void) > +{ > + at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR; > + > + /* serial is in GPBR #2 and revision is in GPBR #3 */ > + system_serial_low = readl(&gpbr->reg[2]); > + system_rev = readl(&gpbr->reg[3]); > +} > +#endif > + > #ifdef CONFIG_CMD_NAND > static void at91sam9x5ek_nand_hw_init(void) > { > @@ -282,6 +309,10 @@ int board_init(void) > /* adress of boot parameters */ > gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100; > > +#ifdef CONFIG_LOAD_ONE_WIRE_INFO > + load_1wire_info(); > +#endif > + > #ifdef CONFIG_CMD_NAND > at91sam9x5ek_nand_hw_init(); > #endif > diff --git a/include/configs/at91sam9x5ek.h b/include/configs/at91sam9x5ek.h > index ee6e3fc..995e43b 100644 > --- a/include/configs/at91sam9x5ek.h > +++ b/include/configs/at91sam9x5ek.h > @@ -38,6 +38,11 @@ > #define CONFIG_CMDLINE_TAG /* enable passing of ATAGs */ > #define CONFIG_SETUP_MEMORY_TAGS > #define CONFIG_INITRD_TAG > + > +#define CONFIG_LOAD_ONE_WIRE_INFO > +#define CONFIG_REVISION_TAG > +#define CONFIG_SERIAL_TAG > + > #define CONFIG_SKIP_LOWLEVEL_INIT > #define CONFIG_BOARD_EARLY_INIT_F > #define CONFIG_DISPLAY_CPUINFO > -- > 1.8.2.2 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
