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SCF(4) Device Drivers Manual (sparc) SCF(4)

scfSPARC Force sysconfig driver

scf0 at mainbus0

The scf driver provides access to the system configuration registers on the Force CPU-5. The system configuration registers control the LED display on the front panel, the status of the rotary switch, and the flash programming control registers.

By setting the sysctl(8) value machdep.led_blink to a non-zero value, the two user LEDs will blink back and forth at a rate of 1 second per point of load average. The seven segment LED will also show a numeric value for the load average (in hex), and with load averages higher than 15, the decimal point will be lit.

The scf device responds to the following ioctl(2) calls defined in <machine/scfio.h>:

(u_int8_t) Set LED1 register based on the bits below.
#define SCF_LED_COLOR_MASK      0x03    /* color bits */
#define SCF_LED_COLOR_OFF       0x00    /* led off */
#define SCF_LED_COLOR_GREEN     0x01    /* green led */
#define SCF_LED_COLOR_RED       0x02    /* red led */
#define SCF_LED_COLOR_YELLOW    0x03    /* yellow led */
#define SCF_LED_BLINK_MASK      0x0c    /* blink bits */
#define SCF_LED_BLINK_NONE      0x00    /* steady led */
#define SCF_LED_BLINK_HALF      0x04    /* blink 1/2 Hz */
#define SCF_LED_BLINK_ONE       0x08    /* blink 1 Hz */
#define SCF_LED_BLINK_TWO       0x0c    /* blink 2 Hz */
(u_int8_t) Retrieve the value of the LED1 register (bits defined above).
(u_int8_t) Set the value of the LED2 register (bits defined above).
(u_int8_t) Retrieve the value of the LED2 register (bits defined above).
(u_int8_t) Set the value of the 7-segment LED based on the bits below:
#define SCF_7LED_A              0x01    /* Layout:      */
#define SCF_7LED_B              0x02    /*      AAA     */
#define SCF_7LED_C              0x04    /*     FF BB    */
#define SCF_7LED_D              0x08    /*      GGG     */
#define SCF_7LED_E              0x10    /*     EE CC    */
#define SCF_7LED_F              0x20    /*      DDD  P  */
#define SCF_7LED_G              0x40
#define SCF_7LED_P              0x80
(u_int8_t) Retrieve the value of the 16 position rotary switch on the front panel.
(u_int8_t) Set up the flash memory for writing based on the bits below:
#define SCF_FMCTRL_SELROM       0x01    /* sel 1st/2nd device */
#define SCF_FMCTRL_SELBOOT      0x02    /* sel boot/user flash */
#define SCF_FMCTRL_WRITEV       0x04    /* write voltage */
#define SCF_FMCTRL_SELADDR      0x38    /* addr 21:19 bits */

The SCF_FMCTRL_SELROM bit, if clear, selects the first flash device, otherwise the second flash device is selected. The SCF_FMCTRL_SELBOOT bit, if set, selects the user flash, otherwise the boot flash is selected. Setting the SCF_FMCTRL_WRITEV bit turns on the write voltage. The SCF_FMCTRL_SELADDR bits determine which window of 512 KBytes is active for reading/writing.

ioctl(2), intro(4), sysctl(8)

OpenBSD support for the scf first appeared in OpenBSD 2.6.

The driver for the scf was written by Jason L. Wright <> under contract with RTMX Incorporated.

January 21, 2014 OpenBSD-6.0