[U-Boot] [PATCH v4] at91: Update MEESC board support

[Tom <Tom.Rix@windriver.com>]

Daniel Gorsulowski wrote:
> This patch implements several updates:
> -disable CONFIG_ENV_OVERWRITE
> -add new hardware style variants and set the arch numbers appropriate
> -pass the serial# and hardware revision to the kernel
> -removed unused macros from include/configs/meesc.h
> -fixed multiline comment style
> 
> Signed-off-by: Daniel Gorsulowski <Daniel.Gorsulowski@esd.eu>
> ---
> v2: - don't write the ethernet address to the EMAC module anymore
> 
> v3: - removed function meesc_set_arch_number and moved code to checkboard()
>     - reworked function get_board_serial()
>     - removed unused macros from include/configs/meesc.h
> 
> v4: - fixed commit message (to many characters)
>     - fixed indentation in switch-case statement
>     - fixed multiline comment style
> 
>  board/esd/meesc/meesc.c |   65 +++++++++++++++++++++++++++++++++++++++++-----
>  include/configs/meesc.h |   25 ++++++------------
>  2 files changed, 66 insertions(+), 24 deletions(-)
> 
> diff --git a/board/esd/meesc/meesc.c b/board/esd/meesc/meesc.c
> index 636d0ed..7cdc04a 100644
> --- a/board/esd/meesc/meesc.c
> +++ b/board/esd/meesc/meesc.c
> @@ -126,8 +126,10 @@ static void meesc_ethercat_hw_init(void)
>  		AT91_SMC_NRDPULSE_(4) | AT91_SMC_NCS_RDPULSE_(9));
>  	at91_sys_write(AT91_SMC1_CYCLE(0),
>  		AT91_SMC_NWECYCLE_(10) | AT91_SMC_NRDCYCLE_(5));
> -	/* Configure behavior at external wait signal, byte-select mode, 16 bit
> -	data bus width, none data float wait states and TDF optimization */
> +	/*
> +	 * Configure behavior at external wait signal, byte-select mode, 16 bit
> +	 * data bus width, none data float wait states and TDF optimization
> +	 */
>  	at91_sys_write(AT91_SMC1_MODE(0),
>  		AT91_SMC_READMODE | AT91_SMC_EXNWMODE_READY |
>  		AT91_SMC_BAT_SELECT | AT91_SMC_DBW_16 | AT91_SMC_TDF_(0) |
> @@ -156,8 +158,32 @@ int board_eth_init(bd_t *bis)
>  int checkboard(void)
>  {
>  	char str[32];
> -
> -	puts("Board: esd CAN-EtherCAT Gateway");
> +	u_char hw_type;	/* hardware type */
> +
> +	/* read the "Type" register of the ET1100 controller */
> +	hw_type = readb(CONFIG_ET1100_BASE);
> +
> +	switch (hw_type) {
> +	case 0x11:
> +	case 0x3F:
> +		/* ET1100 present, arch number of MEESC-Board */
> +		gd->bd->bi_arch_number = MACH_TYPE_MEESC;
> +		puts("Board: CAN-EtherCAT Gateway");
> +		break;
> +	case 0xFF:
> +		/* no ET1100 present, arch number of EtherCAN/2-Board */
> +		gd->bd->bi_arch_number = MACH_TYPE_ETHERCAN2;
> +		puts("Board: EtherCAN/2 Gateway");
> +		/* switch on LED1D */
> +		at91_set_gpio_output(AT91_PIN_PB12, 1);
> +		break;
> +	default:
> +		/* assume, no ET1100 present, arch number of EtherCAN/2-Board */
> +		gd->bd->bi_arch_number = MACH_TYPE_ETHERCAN2;
> +		printf("FATAL! Read invalid hw_type: %02X\n", hw_type);
> +		puts("Board: EtherCAN/2 Gateway");

You may want to soften this "FATAL" to "ERROR"
I would expect a "FATAL" to be followed by a call to hang()

> +		break;
> +	}
>  	if (getenv_r("serial#", str, sizeof(str)) > 0) {
>  		puts(", serial# ");
>  		puts(str);
> @@ -167,6 +193,32 @@ int checkboard(void)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_SERIAL_TAG
> +void get_board_serial(struct tag_serialnr *serialnr)
> +{
> +	char *str;
> +
> +	char *serial = getenv("serial#");
> +	if (serial) {
> +		str = strchr(serial, '_');
> +		if (str && (strlen(str) >= 4)) {
> +			serialnr->high = (*(str + 1) << 8) | *(str + 2);
> +			serialnr->low = simple_strtoul(str + 3, NULL, 16);

How is serial# set?
It seems like this is available if the user explicitly does a `setenv 
serial`
So at best this is a placeholder for future function.
The logic that decodes the variable assumes a format that a user is
not going, in general, to use.


Tom