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@@ -467,6 +467,41 @@ int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
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}
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return 0;
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}
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+
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+int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int areas)
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+{
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+ int err, nodeoffset;
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+ int len;
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+ u8 tmp[8 * 16]; /* Up to 64-bit address + 64-bit size */
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+
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+ if (areas > 8) {
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+ printf("%s: num areas %d exceeds hardcoded limit %d\n",
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+ __func__, areas, 8);
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+ return -1;
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+ }
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+
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+ err = fdt_check_header(blob);
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+ if (err < 0) {
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+ printf("%s: %s\n", __func__, fdt_strerror(err));
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+ return err;
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+ }
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+
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+ /* find or create "/memory" node. */
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+ nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
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+ if (nodeoffset < 0)
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+ return nodeoffset;
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+
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+ len = fdt_pack_reg(blob, tmp, start, size, areas);
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+
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+ err = fdt_setprop(blob, nodeoffset, "linux,usable-memory", tmp, len);
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+ if (err < 0) {
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+ printf("WARNING: could not set %s %s.\n",
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+ "reg", fdt_strerror(err));
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+ return err;
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+ }
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+
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+ return 0;
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+}
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#endif
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int fdt_fixup_memory(void *blob, u64 start, u64 size)
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