From a28afca57df7875f3334407bc47bd66b98701534 Mon Sep 17 00:00:00 2001 From: "David A. Long" Date: Sat, 9 Jul 2011 16:40:19 -0400 Subject: Add uboot "fdt_high" enviroment variable Add a new "fdt_high" enviroment variable. This can be used to control (or prevent) the relocation of the flattened device tree on boot. It can be used to prevent relocation of the fdt into highmem. The variable behaves similarly to the existing "initrd_high" variable. Signed-off-by: David A. Long --- common/image.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 49 insertions(+), 11 deletions(-) (limited to 'common') diff --git a/common/image.c b/common/image.c index e542a57367..c6cd85ef91 100644 --- a/common/image.c +++ b/common/image.c @@ -1234,8 +1234,10 @@ int boot_relocate_fdt (struct lmb *lmb, char **of_flat_tree, ulong *of_size) { void *fdt_blob = *of_flat_tree; void *of_start = 0; + char *fdt_high; ulong of_len = 0; int err; + int disable_relocation = 0; /* nothing to do */ if (*of_size == 0) @@ -1249,26 +1251,62 @@ int boot_relocate_fdt (struct lmb *lmb, char **of_flat_tree, ulong *of_size) /* position on a 4K boundary before the alloc_current */ /* Pad the FDT by a specified amount */ of_len = *of_size + CONFIG_SYS_FDT_PAD; - of_start = (void *)(unsigned long)lmb_alloc_base(lmb, of_len, 0x1000, - getenv_bootm_mapsize() + getenv_bootm_low()); + + /* If fdt_high is set use it to select the relocation address */ + fdt_high = getenv("fdt_high"); + if (fdt_high) { + void *desired_addr = (void *)simple_strtoul(fdt_high, NULL, 16); + + if (((ulong) desired_addr) == ~0UL) { + /* All ones means use fdt in place */ + desired_addr = fdt_blob; + disable_relocation = 1; + } + if (desired_addr) { + of_start = + (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000, + ((ulong) + desired_addr) + + of_len); + if (desired_addr && of_start != desired_addr) { + puts("Failed using fdt_high value for Device Tree"); + goto error; + } + } else { + of_start = + (void *)(ulong) mb_alloc(lmb, of_len, 0x1000); + } + } else { + of_start = + (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000, + getenv_bootm_mapsize() + + getenv_bootm_low()); + } if (of_start == 0) { puts("device tree - allocation error\n"); goto error; } - debug ("## device tree at %p ... %p (len=%ld [0x%lX])\n", - fdt_blob, fdt_blob + *of_size - 1, of_len, of_len); + if (disable_relocation) { + /* We assume there is space after the existing fdt to use for padding */ + fdt_set_totalsize(of_start, of_len); + printf(" Using Device Tree in place at %p, end %p\n", + of_start, of_start + of_len - 1); + } else { + debug ("## device tree at %p ... %p (len=%ld [0x%lX])\n", + fdt_blob, fdt_blob + *of_size - 1, of_len, of_len); - printf (" Loading Device Tree to %p, end %p ... ", - of_start, of_start + of_len - 1); + printf (" Loading Device Tree to %p, end %p ... ", + of_start, of_start + of_len - 1); - err = fdt_open_into (fdt_blob, of_start, of_len); - if (err != 0) { - fdt_error ("fdt move failed"); - goto error; + err = fdt_open_into (fdt_blob, of_start, of_len); + if (err != 0) { + fdt_error ("fdt move failed"); + goto error; + } + puts ("OK\n"); } - puts ("OK\n"); *of_flat_tree = of_start; *of_size = of_len; -- cgit v1.2.3