On Fri, 12 Jul 2019 at 13:51, Igor Opaniuk <igor.opan...@gmail.com> wrote: > > From: Igor Opaniuk <igor.opan...@toradex.com> > > Add support for setting linux,usable-memory property in the memory > node of device tree for the kernel [1]. > > This property holds a base address and size, describing a > limited region in which memory may be considered available for use by > the kernel. Memory outside of this range is not available for use. > > [1] https://www.kernel.org/doc/Documentation/devicetree/bindings/chosen.txt > > Signed-off-by: Igor Opaniuk <igor.opan...@toradex.com> > Signed-off-by: Sanchayan Maity <maitysancha...@gmail.com> > Signed-off-by: Stefan Agner <stefan.ag...@toradex.com> > Signed-off-by: Igor Opaniuk <igor.opan...@gmail.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvo...@toradex.com> > --- > > common/fdt_support.c | 35 +++++++++++++++++++++++++++++++++++ > include/fdt_support.h | 2 ++ > 2 files changed, 37 insertions(+) > > diff --git a/common/fdt_support.c b/common/fdt_support.c > index f31e9b0cc5..57413c7a4d 100644 > --- a/common/fdt_support.c > +++ b/common/fdt_support.c > @@ -473,6 +473,41 @@ int fdt_fixup_memory(void *blob, u64 start, u64 size) > return fdt_fixup_memory_banks(blob, &start, &size, 1); > } > > +int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int areas) > +{ > + int err, nodeoffset; > + int len; > + u8 tmp[8 * 16]; /* Up to 64-bit address + 64-bit size */ > + > + if (areas > 8) { > + printf("%s: num areas %d exceeds hardcoded limit %d\n", > + __func__, areas, 8); > + return -1; > + } > + > + err = fdt_check_header(blob); > + if (err < 0) { > + printf("%s: %s\n", __func__, fdt_strerror(err)); > + return err; > + } > + > + /* find or create "/memory" node. */ > + nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); > + if (nodeoffset < 0) > + return nodeoffset; > + > + len = fdt_pack_reg(blob, tmp, start, size, areas); > + > + err = fdt_setprop(blob, nodeoffset, "linux,usable-memory", tmp, len); > + if (err < 0) { > + printf("WARNING: could not set %s %s.\n", > + "reg", fdt_strerror(err)); > + return err; > + } > + > + return 0; > +} > + > void fdt_fixup_ethernet(void *fdt) > { > int i = 0, j, prop; > diff --git a/include/fdt_support.h b/include/fdt_support.h > index 27fe564f0b..a868b6710e 100644 > --- a/include/fdt_support.h > +++ b/include/fdt_support.h > @@ -102,6 +102,8 @@ static inline int fdt_fixup_memory_banks(void *blob, u64 > start[], u64 size[], > } > #endif > > +int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int banks); > + > void fdt_fixup_ethernet(void *fdt); > int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, > const void *val, int len, int create); > -- > 2.17.1 > > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > https://lists.denx.de/listinfo/u-boot -- Best regards Oleksandr Suvorov cryo...@gmail.com _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot