linux-sunxi/u-boot-sunxi
1
0
Fork 0
mirror of https://github.com/linux-sunxi/u-boot-sunxi.git synced 2024-02-12 11:16:03 +08:00
Code Issues Projects Releases Wiki Activity

cmd: fdt: add fdt overlay application subcommand

Browse Source 
The device tree overlays are a good way to deal with user-modifyable
boards or boards with some kind of an expansion mechanism where we can
easily plug new board in (like the BBB or the raspberry pi).

However, so far, the usual mechanism to deal with it was to have in Linux
some driver detecting the expansion boards plugged in and then request
these overlays using the firmware interface.

That works in most cases, but in some cases, you might want to have the
overlays applied before the userspace comes in. Either because the new
board requires some kind of an early initialization, or because your root
filesystem is accessed through that expansion board.

The easiest solution in such a case is to simply have the component before
Linux applying that overlay, removing all these drawbacks.

Reviewed-by: Stefan Agner <stefan@agner.ch>
Acked-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Maxime Ripard
2016-07-05 10:26:45 +02:00
committed by Tom Rini
parent ddf67f7135
commit e6628ad7b9
2 changed files with 31 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
lib/libfdt/fdt_overlay.c
View File

@ -142,10 +142,10 @@ static int overlay_update_local_node_references(void *fdto,
adj_val += delta;
adj_val = cpu_to_fdt32(adj_val);
ret = fdt_setprop_inplace_namelen_by_index(fdto, tree_node,
name, strlen(name),
index, &adj_val,
sizeof(adj_val));
ret = fdt_setprop_inplace_namelen_partial(fdto, tree_node,
name, strlen(name),
index, &adj_val,
sizeof(adj_val));
if (ret)
return ret;
}
@ -220,9 +220,9 @@ static int overlay_fixup_one_phandle(void *fdt, void *fdto,
return fixup_off;
phandle = cpu_to_fdt32(phandle);
return fdt_setprop_inplace_namelen_by_index(fdto, fixup_off,
name, name_len, index,
&phandle, sizeof(phandle));
return fdt_setprop_inplace_namelen_partial(fdto, fixup_off,
name, name_len, index,
&phandle, sizeof(phandle));
};
static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,