[U-Boot] [PATCH] da850: add NOR boot mode support

[Netagunte, Nagabhushana]

Zundel,
Thanks for your valuable comments. My reply inline.

-Nag

On Fri, Jul 29, 2011 at 13:54:30, Detlev Zundel wrote:
> Hi,
> 
> > From: Nagabhushana Netagunte <nagabhushana.netagunte at ti.com>
> >
> > Add an option to use NOR boot mode in configuration file and 
> > correspanding pin-mux support in board file.
> >
> > Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj at ti.com>
> > Signed-off-by: Nagabhushana Netagunte <nagabhushana.netagunte at ti.com>
> > ---
> >  board/davinci/da8xxevm/da850evm.c |   50 +++++++++++++++++++++++++++++++++++++
> >  include/configs/da850evm.h        |   21 ++++++++++++++-
> >  2 files changed, 70 insertions(+), 1 deletions(-)
> >
> > diff --git a/board/davinci/da8xxevm/da850evm.c 
> > b/board/davinci/da8xxevm/da850evm.c
> > index 73eaa48..a77e438 100644
> > --- a/board/davinci/da8xxevm/da850evm.c
> > +++ b/board/davinci/da8xxevm/da850evm.c
> > @@ -105,6 +105,54 @@ const struct pinmux_config nand_pins[] = {
> >  	{ pinmux(12), 1, 5 },
> >  	{ pinmux(12), 1, 6 }
> >  };
> > +#elif defined(CONFIG_SYS_USE_NOR)
> 
> Can we have at least a little comment explaining what this long magic list does?  I for one don't have the slightest clue to why it has to be like this.
> 
Will add comments.
> > +const struct pinmux_config nor_pins[] = {
> > +	{ pinmux(5), 1, 6 },
> > +	{ pinmux(6), 1, 6 },
> > +	{ pinmux(7), 1, 0 },
> > +	{ pinmux(7), 1, 4 },
> > +	{ pinmux(7), 1, 5 },
> > +	{ pinmux(8), 1, 0 },
> > +	{ pinmux(8), 1, 1 },
> > +	{ pinmux(8), 1, 2 },
> > +	{ pinmux(8), 1, 3 },
> > +	{ pinmux(8), 1, 4 },
> > +	{ pinmux(8), 1, 5 },
> > +	{ pinmux(8), 1, 6 },
> > +	{ pinmux(8), 1, 7 },
> > +	{ pinmux(9), 1, 0 },
> > +	{ pinmux(9), 1, 1 },
> > +	{ pinmux(9), 1, 2 },
> > +	{ pinmux(9), 1, 3 },
> > +	{ pinmux(9), 1, 4 },
> > +	{ pinmux(9), 1, 5 },
> > +	{ pinmux(9), 1, 6 },
> > +	{ pinmux(9), 1, 7 },
> > +	{ pinmux(10), 1, 0 },
> > +	{ pinmux(10), 1, 1 },
> > +	{ pinmux(10), 1, 2 },
> > +	{ pinmux(10), 1, 3 },
> > +	{ pinmux(10), 1, 4 },
> > +	{ pinmux(10), 1, 5 },
> > +	{ pinmux(10), 1, 6 },
> > +	{ pinmux(10), 1, 7 },
> > +	{ pinmux(11), 1, 0 },
> > +	{ pinmux(11), 1, 1 },
> > +	{ pinmux(11), 1, 2 },
> > +	{ pinmux(11), 1, 3 },
> > +	{ pinmux(11), 1, 4 },
> > +	{ pinmux(11), 1, 5 },
> > +	{ pinmux(11), 1, 6 },
> > +	{ pinmux(11), 1, 7 },
> > +	{ pinmux(12), 1, 0 },
> > +	{ pinmux(12), 1, 1 },
> > +	{ pinmux(12), 1, 2 },
> > +	{ pinmux(12), 1, 3 },
> > +	{ pinmux(12), 1, 4 },
> > +	{ pinmux(12), 1, 5 },
> > +	{ pinmux(12), 1, 6 },
> > +	{ pinmux(12), 1, 7 }
> > +};
> >  #endif
> >  
> >  #ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII @@ -122,6 +170,8 @@ static 
> > const struct pinmux_resource pinmuxes[] = {
> >  	PINMUX_ITEM(i2c_pins),
> >  #ifdef CONFIG_NAND_DAVINCI
> >  	PINMUX_ITEM(nand_pins),
> > +#elif defined(CONFIG_USE_NOR)
> > +	PINMUX_ITEM(nor_pins),
> >  #endif
> >  };
> >  
> > diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h 
> > index fdcc6e3..f0015e4 100644
> > --- a/include/configs/da850evm.h
> > +++ b/include/configs/da850evm.h
> > @@ -28,6 +28,8 @@
> >   */
> >  #define CONFIG_DRIVER_TI_EMAC
> >  #define CONFIG_USE_SPIFLASH
> > +#undef CONFIG_USE_NAND
> > +#undef CONFIG_SYS_USE_NOR
> >  
> >  /*
> >   * SoC Configuration
> > @@ -129,6 +131,23 @@
> >  #define CONFIG_NET_MULTI
> >  #endif
> >  
> > +#ifdef CONFIG_SYS_USE_NOR
> > +#define CONFIG_ENV_IS_IN_FLASH
> > +#undef CONFIG_SYS_NO_FLASH
> > +#define CONFIG_FLASH_CFI_DRIVER
> > +#define CONFIG_SYS_FLASH_CFI
> > +#define CONFIG_SYS_FLASH_PROTECTION
> > +#define CONFIG_SYS_MAX_FLASH_BANKS	1 /* max number of flash banks */
> > +#define CONFIG_SYS_FLASH_SECT_SZ	(128 << 10) /* 128KB */
> > +#define CONFIG_ENV_OFFSET		(CONFIG_SYS_FLASH_SECT_SZ * 3)
> > +#define CONFIG_ENV_SIZE			(128 << 10)
> > +#define CONFIG_SYS_FLASH_BASE		DAVINCI_ASYNC_EMIF_DATA_CE2_BASE
> > +#define PHYS_FLASH_SIZE			(8 << 20) /* Flash size 8MB */
> > +#define CONFIG_SYS_MAX_FLASH_SECT ((PHYS_FLASH_SIZE/CONFIG_SYS_FLASH_SECT_SZ)\
> > +	       + 3)
> > +#define CONFIG_ENV_SECT_SIZE		CONFIG_SYS_FLASH_SECT_SZ
> > +#endif
> > +
> >  #ifdef CONFIG_USE_SPIFLASH
> >  #undef CONFIG_ENV_IS_IN_FLASH
> >  #undef CONFIG_ENV_IS_IN_NAND
> > @@ -212,7 +231,7 @@
> >  #endif
> >  
> >  #if !defined(CONFIG_USE_NAND) && \
> > -	!defined(CONFIG_USE_NOR) && \
> > +	!defined(CONFIG_SYS_USE_NOR) && \
> >  	!defined(CONFIG_USE_SPIFLASH)
> >  #define CONFIG_ENV_IS_NOWHERE
> >  #define CONFIG_SYS_NO_FLASH
> 
> Also I am somewhat sceptical about the names of the defines in this board config - there is for example the new CONFIG_SYS_USE_NOR and the "old" CONFIG_USE_NAND and CONFIG_USE_SPIFLASH.  Looking into the README, I see this:
> 
> ,----[ README ]
> | There are two classes of configuration variables:
> | 
> | * Configuration _OPTIONS_:
> |   These are selectable by the user and have names beginning with
> |   "CONFIG_".
> | 
> | * Configuration _SETTINGS_:
> |   These depend on the hardware etc. and should not be meddled with if
> |   you don't know what you're doing; they have names beginning with
> |   "CONFIG_SYS_".
> `----
> 
> If the names are chosen correctly, then CONFIG_SYS_USE_NOR is coupled to the actual hardware, so either the hardware _has_ NOR flash, then it must be set, or it _doesn't_ have NOR flash, then we don't set it.  But it seems the options are there to give the user a choice what medium he wants to use (for e.g. the environment).  So if this is correct, then please strip the _SYS_ in them.
> 
> Cheers
>   Detlev
> 
Will take care CONFIG name.
> --
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> If you know why this number is perfect - you're probably a mathematician...
> --
> DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
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