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Nokia RX-51: Update documentation about flashing

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This change contains update for doc/README.nokia_rx51 documentation file
with information how to load U-Boot image to device RAM without need to
flash it and also how to flash it into OneNAND via 0xFFFF flasher.

Signed-off-by: Pali Rohár <pali@kernel.org>
This commit is contained in:
Pali Rohár 2022-01-24 20:45:53 +01:00 committed by Heinrich Schuchardt
parent 8f89e194d6
commit 41c3ef4858
1 changed files with 45 additions and 0 deletions
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doc/README.nokia_rx51
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@ -22,6 +22,51 @@ following repository:
https://github.com/pali/u-boot-maemo
To generate combined.bin image from u-boot.bin and kernel.bin (either uImage
or zImage) use:
sh u-boot-gen-combined u-boot.bin kernel.bin combined.bin
Original Maemo Fremantle PR1.3 zImage kernel binary is available at:
http://repository.maemo.org/pool/maemo5.0/free/k/kernel/kernel_2.6.28-20103103+0m5_armel.deb
To unpack it (from DEB/AR, TAR and FIASCO) call commands:
ar x kernel_2.6.28-20103103+0m5_armel.deb data.tar.gz
tar -O -xf data.tar.gz ./boot/zImage-2.6.28-20103103+0m5.fiasco > kernel_2.6.28-20103103+0m5.fiasco
0xFFFF -M kernel_2.6.28-20103103+0m5.fiasco -u
Flashed image must start with 2 kB "NOLO!img" header which contains size of
the image. Header consist of bytes "NOLO!img\x02\x00\x00\x00\x00\x00\x00\x00"
followed by 4 byte little endian size of the image and rest of the 2 kB header
are just zero bytes.
Nokia proprietary flasher and also open source 0xFFFF flasher automatically
prepend required "NOLO!img" header and both applications expect that image
does not contain "NOLO!img" header. Adding "NOLO!img" header is required
only in case using "nandwrite" tool for flashing.
Open source 0xFFFF flasher is available in following repository:
https://github.com/pali/0xFFFF
It is possible to load u-boot.bin via USB to N900 RAM and boot it without
need to flashing it. Via 0xFFFF running at host PC it is done:
0xFFFF -m u-boot.bin -l -b
0xFFFF support also flashing kernel image either via USB or directly on
N900 device. Flashing u-boot/kernel/combined image is done as:
0xFFFF -m combined.bin -f
Via 0xFFFF is possible to generate also standard flashable image in Nokia
FIASCO format which contains metadata information like device identification
(RX-51) and version string (v2021.04):
0xFFFF -m RX-51:v2021.04:kernel:u-boot.bin -g u-boot.fiasco
There is support for hardware watchdog. Hardware watchdog is started by
NOLO so u-boot must kick watchdog to prevent reboot device (but not very
often, max every 2 seconds). There is also support for framebuffer display