On Tue, Jan 03, 2023 at 10:54:48PM +0100, Ahmad Fatoum wrote: > The barebox i.MX images have a preamble that pads the i.MX header to the > offset expected by the BootROM. This allows writing barebox images > directly to offset 0 on SD-Cards and eMMC user area. For some i.MX8M, > these images can't be directly written to eMMC boot partitions and > instead require special handling. Add a note about this to the > documentation. > > Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> > --- > Documentation/boards/imx/nxp-imx8mm-evk.rst | 18 ++++++++++++++++ > Documentation/boards/imx/nxp-imx8mn-evk.rst | 24 +++++++++++++++++++++ > Documentation/boards/imx/nxp-imx8mp-evk.rst | 24 +++++++++++++++++++++ > 3 files changed, 66 insertions(+) > > diff --git a/Documentation/boards/imx/nxp-imx8mm-evk.rst b/Documentation/boards/imx/nxp-imx8mm-evk.rst > index c3cd35ae38a2..7ed7459c08a6 100644 > --- a/Documentation/boards/imx/nxp-imx8mm-evk.rst > +++ b/Documentation/boards/imx/nxp-imx8mm-evk.rst > @@ -69,3 +69,21 @@ board for serial download mode as printed on the PCB. You can start barebox with > the imx-usb-loader tool that comes with barebox like this: > > ./scripts/imx/imx-usb-loader images/barebox-nxp-imx8mm-evk.img > + > +Installing barebox > +================== > + > +When the EVK is strapped to boot from eMMC, the i.MX8M bootrom will > +consult the eMMC ext_csd register to determine whether to boot > +from the active eMMC boot partition or from the user area. > + > +The same barebox image written to the start of the SD-Card can > +be written to the start of the eMMC user area. Power-fail installation > +to the eMMC boot partition requires special handling: "Power-fail installation" sounds strange. What you mean is an installation into the boot partitions which can be updated power fail safely. I don't know how to put that into two words, maybe just drop the "Power-fail" part. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
