| Message ID | 1504555943-12893-10-git-send-email-pantelis.antoniou@konsulko.com |
|---|---|
| State | Accepted |
| Delegated to: | Simon Glass |
| Headers | show |
| Series | uboot overlays, FIT image & unittest | expand |
On 09/04/2017 10:12 PM, Pantelis Antoniou wrote: > We have the capability to apply overlays on the command line but > we didn't have a document explaining how. > > Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> > --- > doc/README.fdt-overlays | 37 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 37 insertions(+) > create mode 100644 doc/README.fdt-overlays > > diff --git a/doc/README.fdt-overlays b/doc/README.fdt-overlays > new file mode 100644 > index 0000000..ee868ec > --- /dev/null > +++ b/doc/README.fdt-overlays > @@ -0,0 +1,37 @@ > +U-Boot FDT Overlay usage (without FIT images) > +============================================= > + > +FDT overlays are now available for use even without FIT images. > +It is not as automagic as with FIT images though and require a few > +manual steps. > + > +1. Figure out where to place both the base device tree blob and the > +overlay. Make sure you have enough space to grow the base tree without > +overlapping anything. > + > +=> setenv fdtaddr 0x87f00000 > +=> setenv fdtovaddr 0x87fc0000 > + > +2. Load the base blob and overlay blobs > + > +=> load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/base.dtb > +=> load ${devtype} ${bootpart} ${fdtovaddr} ${bootdir}/overlay.dtb > + > +3. Set it as the working fdt tree. > + > +=> fdtaddr $fdtaddr > + > +4. Grow it enough so it can 'fit' all the applied overlays > + > +=> fdt resize 8192 > + > +5. You are now ready to apply the overlay. > + > +=> fdt apply $fdtovaddr > + > +Please note that in case of an error, both the base and overlays are going > +to be invalidated, so keep copies to avoid reloading. > + > +Pantelis Antoniou > +pantelis.antoniou@konsulko.com > +11/7/2017 > Reviewed-by: Łukasz Majewski
On 4 September 2017 at 14:12, Pantelis Antoniou <pantelis.antoniou@konsulko.com> wrote: > We have the capability to apply overlays on the command line but > we didn't have a document explaining how. > > Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> > --- > doc/README.fdt-overlays | 37 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 37 insertions(+) > create mode 100644 doc/README.fdt-overlays > Acked-by: Simon Glass <sjg@chromium.org>
On 4 September 2017 at 14:12, Pantelis Antoniou <pantelis.antoniou@konsulko.com> wrote: > We have the capability to apply overlays on the command line but > we didn't have a document explaining how. > > Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> > --- > doc/README.fdt-overlays | 37 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 37 insertions(+) > create mode 100644 doc/README.fdt-overlays > Acked-by: Simon Glass <sjg@chromium.org> Applied to u-boot-fdt thanks!
diff --git a/doc/README.fdt-overlays b/doc/README.fdt-overlays new file mode 100644 index 0000000..ee868ec --- /dev/null +++ b/doc/README.fdt-overlays @@ -0,0 +1,37 @@ +U-Boot FDT Overlay usage (without FIT images) +============================================= + +FDT overlays are now available for use even without FIT images. +It is not as automagic as with FIT images though and require a few +manual steps. + +1. Figure out where to place both the base device tree blob and the +overlay. Make sure you have enough space to grow the base tree without +overlapping anything. + +=> setenv fdtaddr 0x87f00000 +=> setenv fdtovaddr 0x87fc0000 + +2. Load the base blob and overlay blobs + +=> load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/base.dtb +=> load ${devtype} ${bootpart} ${fdtovaddr} ${bootdir}/overlay.dtb + +3. Set it as the working fdt tree. + +=> fdtaddr $fdtaddr + +4. Grow it enough so it can 'fit' all the applied overlays + +=> fdt resize 8192 + +5. You are now ready to apply the overlay. + +=> fdt apply $fdtovaddr + +Please note that in case of an error, both the base and overlays are going +to be invalidated, so keep copies to avoid reloading. + +Pantelis Antoniou +pantelis.antoniou@konsulko.com +11/7/2017
We have the capability to apply overlays on the command line but we didn't have a document explaining how. Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> --- doc/README.fdt-overlays | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 doc/README.fdt-overlays