This patch adds fdt support to boot linux, followed Michal's work on microblaze.
Signed-off-by: Thomas Chou thomas@wytron.com.tw --- arch/nios2/lib/bootm.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/arch/nios2/lib/bootm.c b/arch/nios2/lib/bootm.c index 5d25edf..defa1fc 100644 --- a/arch/nios2/lib/bootm.c +++ b/arch/nios2/lib/bootm.c @@ -34,6 +34,18 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) char *commandline = getenv("bootargs"); ulong initrd_start = images->rd_start; ulong initrd_end = images->rd_end; + char *of_flat_tree = NULL; +#if defined(CONFIG_OF_LIBFDT) + ulong of_size = 0; + + /* find flattened device tree */ + if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size)) + return 1; +#endif + if (!of_flat_tree) + of_flat_tree = (char *)simple_strtoul(argv[3], NULL, 16); + if (of_flat_tree) + initrd_end = (ulong)of_flat_tree;
if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) return 1; @@ -45,6 +57,15 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline); debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end); + /* kernel parameters passing + * r4 : NIOS magic + * r5 : initrd start + * r6 : initrd end or fdt + * r7 : kernel command line + * fdt is passed to kernel via r6, the same as initrd_end. fdt will be + * verified with fdt magic. when both initrd and fdt are used at the + * same time, fdt must follow immediately after initrd. + */ kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline); /* does not return */