mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-15 17:28:15 +00:00
f7aa59b29a
The evaluation kit has both Nand and OneNand, both drivers are there and the two configurations only select a different default for the jffs partition. This adds the OneNand driver and cleans up storage. Signed-off-by: Alessandro Rubini <rubini@unipv.it> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
32 lines
1.3 KiB
Text
32 lines
1.3 KiB
Text
|
|
The Nomadik 8815 CPU has a "secure" boot mode where no external access
|
|
(not even JTAG) is allowed. The "remap" bits in the evaluation board
|
|
are configured in order to boot from the internal ROM memory (in
|
|
secure mode).
|
|
|
|
The boot process as defined by the manufacturer executes external code
|
|
(loaded from NAND or OneNAND) that that disables such "security" in
|
|
order to run u-boot and later the kernel without constraints. Such
|
|
code is a proprietary initial boot loader, called "X-Loader" (in case
|
|
anyone wonders, it has no relations with other loaders with the same
|
|
name and there is no GPL code inside the ST X-Loader).
|
|
|
|
SDRAM configuration, PLL setup and initial loading from NAND is
|
|
implemented in the X-Loader, so U-Boot is already running in SDRAM
|
|
when control is handed over to it.
|
|
|
|
The Makefile offers two different configurations to be used if you
|
|
boot from Nand or OneNand.
|
|
|
|
make nhk8815_config
|
|
make nhk8815_onenand_config
|
|
|
|
Both support OneNand and Nand. Since U-Boot, running in RAM, can't know
|
|
where it was loaded from, the configurations differ in where the filesystem
|
|
is looked for by default.
|
|
|
|
|
|
On www.st.com/nomadik and on www.stnwireless.com there are documents,
|
|
summary data and white papers on Nomadik. The full datasheet for
|
|
STn8815 is not currently available on line but under specific request
|
|
to the local ST sales offices.
|