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discard initial numbers from rng, broadcom says they are "less random"

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This commit is contained in:
jmcneill 2013-01-30 11:52:54 +00:00
parent d5c11b0d60
commit df76c7b4bf
1 changed files with 5 additions and 2 deletions
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7
sys/arch/arm/broadcom/bcm2835_rng.c
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@ -1,4 +1,4 @@
/* $NetBSD: bcm2835_rng.c,v 1.1 2013/01/25 00:04:06 jmcneill Exp $ */
/* $NetBSD: bcm2835_rng.c,v 1.2 2013/01/30 11:52:54 jmcneill Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bcm2835_rng.c,v 1.1 2013/01/25 00:04:06 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: bcm2835_rng.c,v 1.2 2013/01/30 11:52:54 jmcneill Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -109,6 +109,9 @@ bcmrng_attach(device_t parent, device_t self, void *aux)
callout_init(&sc->sc_tick, CALLOUT_MPSAFE);
callout_setfunc(&sc->sc_tick, bcmrng_tick, sc);
/* discard initial numbers, broadcom says they are "less random" */
bus_space_write_4(sc->sc_iot, sc->sc_ioh, RNG_STATUS, 0x40000);
/* enable rng */
ctrl = bus_space_read_4(sc->sc_iot, sc->sc_ioh, RNG_CTRL);
ctrl |= RNG_CTRL_EN;