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author | Wolfgang Denk <wd@denx.de> | 2009-02-01 21:38:07 +0100 |
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committer | Wolfgang Denk <wd@denx.de> | 2009-02-01 21:38:07 +0100 |
commit | 6c6e042ab3bbfb5428e4cdeb38fa27728c63afdd (patch) | |
tree | 0458ea450c3674b3d7aba64157e346f1d2553278 /doc/README.nmdk8815 | |
parent | ee924e00300bd1136589b2d5f8ad1f008df01bd4 (diff) | |
parent | 4e69087a1d6ef2eca6f46026cf5e7399b6c9e7c0 (diff) | |
download | u-boot-imx-6c6e042ab3bbfb5428e4cdeb38fa27728c63afdd.zip u-boot-imx-6c6e042ab3bbfb5428e4cdeb38fa27728c63afdd.tar.gz u-boot-imx-6c6e042ab3bbfb5428e4cdeb38fa27728c63afdd.tar.bz2 |
Merge branch 'master' of git://git.denx.de/u-boot-arm
Diffstat (limited to 'doc/README.nmdk8815')
-rw-r--r-- | doc/README.nmdk8815 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/README.nmdk8815 b/doc/README.nmdk8815 new file mode 100644 index 0000000..453cfae --- /dev/null +++ b/doc/README.nmdk8815 @@ -0,0 +1,22 @@ + +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. + + +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. |