[ppc] Add basic support for the Freescale MPC52xx embedded CPU and the LITE5200 platform

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/Documentation/powerpc/mpc52xx.txt b/Documentation/powerpc/mpc52xx.txt
new file mode 100644
index 0000000000000..6efe0a0a5bf52
--- /dev/null
+++ b/Documentation/powerpc/mpc52xx.txt
@@ -0,0 +1,48 @@
+Linux 2.6.x on MPC52xx family
+-----------------------------
+
+For the latest info, go to http://www.246tNt.com/mpc52xx/state.txt
+ 
+To compile/use :
+
+  - U-Boot:
+     # <edit Makefile to set ARCH=ppc & CROSS_COMPILE=... ( also EXTRAVERSION
+        if you wish to ).
+     # make lite5200_defconfig
+     # make uImage
+    
+     then, on U-boot:
+     => tftpboot 200000 uImage
+     => tftpboot 400000 pRamdisk
+     => bootm 200000 400000
+    
+  - DBug:
+     # <edit Makefile to set ARCH=ppc & CROSS_COMPILE=... ( also EXTRAVERSION
+        if you wish to ).
+     # make lite5200_defconfig
+     # cp your_initrd.gz arch/ppc/boot/images/ramdisk.image.gz
+     # make zImage.initrd 
+     # make 
+
+     then in DBug:
+     DBug> dn -i zImage.initrd.lite5200
+     
+
+Some remarks :
+ - The port is named mpc52xxx, and config options are PPC_MPC52xx. The MGT5100
+   is not supported, and I'm not sure anyone is interesting in working on it
+   so. I didn't took 5xxx because there's apparently a lot of 5xxx that have
+   nothing to do with the MPC5200. I also included the 'MPC' for the same
+   reason.
+ - Of course, I inspired myself from the 2.4 port. If you think I forgot to
+   mention you/your company in the copyright of some code, I'll correct it
+   ASAP.
+ - The codes wants the MBAR to be set at 0xf0000000 by the bootloader. It's
+   mapped 1:1 with the MMU. If for whatever reason, you want to change this,
+   beware that some code depends on the 0xf0000000 address and other depends
+   on the 1:1 mapping.
+ - Most of the code assumes that port multiplexing, frequency selection, ...
+   has already been done. IMHO this should be done as early as possible, in
+   the bootloader. If for whatever reason you can't do it there, do it in the
+   platform setup code (if U-Boot) or in the arch/ppc/boot/simple/... (if
+   DBug)