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Add support for boot arguments specification via fdt

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Add suppport for passing boot arguments via FDT for mediatek/ralink SoCs.
This was taken from kan's work on CI20.

Since most OpenWRT dts files have bootargs defined, we use bsdbootargs
to specify FreeBSD specific arguments.

Approved by:	adrian (mentor)
Sponsored by:	Smartcom - Bulgaria AD
Differential Revision:	https://reviews.freebsd.org/D5979
This commit is contained in:
sgalabov 2016-04-16 19:44:41 +00:00
parent 146045bcc3
commit 056d436755
1 changed files with 55 additions and 0 deletions
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55
sys/mips/mediatek/mtk_machdep.c
View File

@ -192,6 +192,52 @@ mips_init(void)
#endif
}
static void
_parse_bootarg(char *v)
{
char *n;
if (*v == '-') {
while (*v != '\0') {
v++;
switch (*v) {
case 'a': boothowto |= RB_ASKNAME; break;
/* Someone should simulate that ;-) */
case 'C': boothowto |= RB_CDROM; break;
case 'd': boothowto |= RB_KDB; break;
case 'D': boothowto |= RB_MULTIPLE; break;
case 'm': boothowto |= RB_MUTE; break;
case 'g': boothowto |= RB_GDB; break;
case 'h': boothowto |= RB_SERIAL; break;
case 'p': boothowto |= RB_PAUSE; break;
case 'r': boothowto |= RB_DFLTROOT; break;
case 's': boothowto |= RB_SINGLE; break;
case 'v': boothowto |= RB_VERBOSE; break;
}
}
} else {
n = strsep(&v, "=");
if (v == NULL)
kern_setenv(n, "1");
else
kern_setenv(n, v);
}
}
/* Parse cmd line args as env - copied from xlp_machdep. */
/* XXX-BZ this should really be centrally provided for all (boot) code. */
static void
_parse_bootargs(char *cmdline)
{
char *v;
while ((v = strsep(&cmdline, " \n")) != NULL) {
if (*v == '\0')
continue;
_parse_bootarg(v);
}
}
void
platform_reset(void)
{
@ -209,6 +255,8 @@ platform_start(__register_t a0 __unused, __register_t a1 __unused,
char **argv = (char **)MIPS_PHYS_TO_KSEG0(a1);
char **envp = (char **)MIPS_PHYS_TO_KSEG0(a2);
void *dtbp;
phandle_t chosen;
char buf[2048];
/* clear the BSS and SBSS segments */
kernend = (vm_offset_t)&end;
@ -238,6 +286,13 @@ platform_start(__register_t a0 __unused, __register_t a1 __unused,
init_static_kenv(boot1_env, sizeof(boot1_env));
/*
* Get bsdbootargs from FDT if specified.
*/
chosen = OF_finddevice("/chosen");
if (OF_getprop(chosen, "bsdbootargs", buf, sizeof(buf)) != -1)
_parse_bootargs(buf);
printf("FDT DTB at: 0x%08x\n", (uint32_t)dtbp);
printf("CPU clock: %4dMHz\n", mtk_soc_get_cpuclk()/(1000*1000));