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DeviceTree: add support for initrd in the DT 

Add the initrd start and end address to the DT, code comes from u-boot.

Signed-off-by: Vicente Bergas <vicencb@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Vicente Bergas 2013-02-12 00:04:59 +01:00 committed by Sascha Hauer
parent c0ba0a64ae
commit afab6ac783
3 changed files with 76 additions and 0 deletions
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2
arch/arm/lib/armlinux.c
View File

@ -266,6 +266,8 @@ void start_linux(void *adr, int swap, unsigned long initrd_address,
if (oftree) {
printf("booting Linux kernel with devicetree\n");
fdt_initrd(oftree, initrd_address,
initrd_address + initrd_size, 1);
params = oftree;
} else {
setup_tags(initrd_address, initrd_size, swap);

66
common/oftree.c
View File

@ -246,6 +246,72 @@ int fdt_get_path_or_create(struct fdt_header *fdt, const char *path)
return nodeoffset;
}
int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
{
int nodeoffset;
int err, j, total;
u32 tmp;
const char *path;
uint64_t addr, size;
/* Find the "chosen" node */
nodeoffset = fdt_path_offset(fdt, "/chosen");
/* If there is no "chosen" node in the blob return */
if (nodeoffset < 0) {
printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset));
return nodeoffset;
}
/* just return if initrd_start/end aren't valid */
if ((initrd_start == 0) || (initrd_end == 0))
return 0;
total = fdt_num_mem_rsv(fdt);
/*
* Look for an existing entry and update it. If we don't find
* the entry, we will j be the next available slot.
*/
for (j = 0; j < total; j++) {
err = fdt_get_mem_rsv(fdt, j, &addr, &size);
if (addr == initrd_start) {
fdt_del_mem_rsv(fdt, j);
break;
}
}
err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
if (err < 0) {
printf("fdt_initrd: %s\n", fdt_strerror(err));
return err;
}
path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
if (!path || force) {
tmp = __cpu_to_be32(initrd_start);
err = fdt_setprop(fdt, nodeoffset,
"linux,initrd-start", &tmp, sizeof(tmp));
if (err < 0) {
printf("WARNING: "
"could not set linux,initrd-start %s.\n",
fdt_strerror(err));
return err;
}
tmp = __cpu_to_be32(initrd_end);
err = fdt_setprop(fdt, nodeoffset,
"linux,initrd-end", &tmp, sizeof(tmp));
if (err < 0) {
printf("WARNING: could not set linux,initrd-end %s.\n",
fdt_strerror(err));
return err;
}
}
return 0;
}
static int of_fixup_bootargs(struct fdt_header *fdt)
{
int nodeoffset;

8
include/of.h
View File

@ -18,6 +18,14 @@ void do_fixup_by_path(struct fdt_header *fdt, const char *path, const char *prop
void do_fixup_by_path_u32(struct fdt_header *fdt, const char *path, const char *prop,
u32 val, int create);
int fdt_get_path_or_create(struct fdt_header *fdt, const char *path);
#ifdef CONFIG_FDT
int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force);
#else
static inline int fdt_initrd(void *fdt, ulong start, ulong end, int force)
{
return 0;
}
#endif
#define OF_BAD_ADDR ((u64)-1)