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Handle using "octeth" as root device by converting "octethN" to "cnmacN"

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for any N < 100.  This allows booting for u-boot to use root=$(ethact)
on the command line and the kernel can use the ethernet interface the
kernel was loaded on as the NFS root device.
This commit is contained in:
simonb 2020-08-17 06:23:01 +00:00
parent de5f9e0f37
commit 02abda66c9
1 changed files with 14 additions and 2 deletions
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16
sys/arch/evbmips/cavium/autoconf.c
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@ -1,4 +1,4 @@
/* $NetBSD: autoconf.c,v 1.8 2020/06/23 05:19:12 simonb Exp $ */
/* $NetBSD: autoconf.c,v 1.9 2020/08/17 06:23:01 simonb Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
@ -36,7 +36,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.8 2020/06/23 05:19:12 simonb Exp $");
__KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.9 2020/08/17 06:23:01 simonb Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -95,12 +95,24 @@ findroot(void)
return;
if (rootspec && *rootspec) {
/* if we get passed root=octethN, convert to cnmacN */
if (strncmp(rootspec, "octeth", 6) == 0) {
/* allow for up to 100 interfaces */
static char buf[sizeof("cnmacXX")];
const char *cp = &rootspec[strlen("octeth")];
KASSERT(strlen(cp) < sizeof("XX"));
snprintf(buf, sizeof(buf), "cnmac%s", cp);
rootspec = buf;
}
/* XXX hard coded "cnmac" for network boot */
if (strncmp(rootspec, "cnmac", 5) == 0) {
rootfstype = "nfs";
netboot = 1;
return;
}
/*
* XXX
* Assume that if the root spec is not a cnmac, it'll