--- /dev/null
+Freescale MPC8641HPCN board
+===========================
+
+Created 05/24/2006 Haiying Wang
+-------------------------------
+
+1. Building U-Boot
+------------------
+The 86xx HPCN code base is known to compile using:
+ Binutils 2.15, Gcc 3.4.3, Glibc 2.3.3
+
+ $ make MPC8641HPCN_config
+ Configuring for MPC8641HPCN board...
+
+ $ make
+
+
+2. Switch and Jumper Setting
+----------------------------
+Jumpers:
+ J14 Pins 1-2 (near plcc32 socket)
+
+Switches:
+ SW1(1-5) = 01100 CONFIG_SYS_COREPLL = 01000 :: CORE = 2:1
+ 01100 :: CORE = 2.5:1
+ 10000 :: CORE = 3:1
+ 11100 :: CORE = 3.5:1
+ 10100 :: CORE = 4:1
+ 01110 :: CORE = 4.5:1
+ SW1(6-8) = 001 CONFIG_SYS_SYSCLK = 000 :: SYSCLK = 33MHz
+ 001 :: SYSCLK = 40MHz
+
+ SW2(1-4) = 1100 CONFIG_SYS_CCBPLL = 0010 :: 2X
+ 0100 :: 4X
+ 0110 :: 6X
+ 1000 :: 8X
+ 1010 :: 10X
+ 1100 :: 12X
+ 1110 :: 14X
+ 0000 :: 16X
+ SW2(5-8) = 1110 CONFIG_SYS_BOOTLOC = 1110 :: boot 16-bit localbus
+
+ SW3(1-7) = 0011000 CONFIG_SYS_VID = 0011000 :: VCORE = 1.2V
+ 0100000 :: VCORE = 1.11V
+ SW3(8) = 0 VCC_PLAT = 0 :: VCC_PLAT = 1.2V
+ 1 :: VCC_PLAT = 1.0V
+
+ SW4(1-2) = 11 CONFIG_SYS_HOSTMODE = 11 :: both prots host/root
+ SW4(3-4) = 11 CONFIG_SYS_BOOTSEQ = 11 :: no boot seq
+ SW4(5-8) = 0011 CONFIG_SYS_IOPORT = 0011 :: both PEX
+
+ SW5(1) = 1 CONFIG_SYS_FLASHMAP = 1 :: boot from flash
+ 0 :: boot from PromJet
+ SW5(2) = 1 CONFIG_SYS_FLASHBANK = 1 :: swap upper/lower
+ halves (virtual banks)
+ 0 :: normal
+ SW5(3) = 0 CONFIG_SYS_FLASHWP = 0 :: not protected
+ SW5(4) = 0 CONFIG_SYS_PORTDIV = 1 :: 2:1 for PD4
+ 1:1 for PD6
+ SW5(5-6) = 11 CONFIG_SYS_PIXISOPT = 11 :: s/w determined
+ SW5(7-8) = 11 CONFIG_SYS_LADOPT = 11 :: s/w determined
+
+ SW6(1) = 1 CONFIG_SYS_CPUBOOT = 1 :: no boot holdoff
+ SW6(2) = 1 CONFIG_SYS_BOOTADDR = 1 :: no traslation
+ SW6(3-5) = 000 CONFIG_SYS_REFCLKSEL = 000 :: 100MHZ
+ SW6(6) = 1 CONFIG_SYS_SERROM_ADDR= 1 ::
+ SW6(7) = 1 CONFIG_SYS_MEMDEBUG = 1 ::
+ SW6(8) = 1 CONFIG_SYS_DDRDEBUG = 1 ::
+
+ SW8(1) = 1 ACZ_SYNC = 1 :: 48MHz on TP49
+ SW8(2) = 1 ACB_SYNC = 1 :: THRMTRIP disabled
+ SW8(3) = 1 ACZ_SDOUT = 1 :: p4 mode
+ SW8(4) = 1 ACB_SDOUT = 1 :: PATA freq. = 133MHz
+ SW8(5) = 0 SUSLED = 0 :: SouthBridge Mode
+ SW8(6) = 0 SPREAD = 0 :: REFCLK SSCG Disabled
+ SW8(7) = 1 ACPWR = 1 :: non-battery
+ SW8(8) = 0 CONFIG_SYS_IDWP = 0 :: write enable
+
+
+3. Flash U-Boot
+---------------
+The flash range 0xEF800000 to 0xEFFFFFFF can be divided into 2 halves.
+It is possible to use either half to boot using u-boot. Switch 5 bit 2
+is used for this purpose.
+
+0xEF800000 to 0xEFBFFFFF - 4MB
+0xEFC00000 to 0xEFFFFFFF - 4MB
+When this bit is 0, U-Boot is at 0xEFF00000.
+When this bit is 1, U-Boot is at 0xEFB00000.
+
+Use the above mentioned flash commands to program the other half, and
+use switch 5, bit 2 to alternate between the halves. Note: The booting
+version of U-Boot will always be at 0xEFF00000.
+
+To Flash U-Boot into the booting bank (0xEFC00000 - 0xEFFFFFFF):
+
+ tftp 1000000 u-boot.bin
+ protect off all
+ erase eff00000 +$filesize
+ cp.b 1000000 eff00000 $filesize
+
+or use tftpflash command:
+ run tftpflash
+
+To Flash U-boot into the alternative bank (0xEF800000 - 0xEFBFFFFF):
+
+ tftp 1000000 u-boot.bin
+ erase efb00000 +$filesize
+ cp.b 1000000 efb00000 $filesize
+
+
+4. Memory Map
+-------------
+NOTE: RIO and PCI are mutually exclusive, so they share an address
+
+For 32-bit u-boot, devices are mapped so that the virtual address ==
+the physical address, and the map looks liks this:
+
+ Memory Range Device Size
+ ------------ ------ ----
+ 0x0000_0000 0x7fff_ffff DDR 2G
+ 0x8000_0000 0x9fff_ffff RIO MEM 512M
+ 0x8000_0000 0x9fff_ffff PCI1/PEX1 MEM 512M
+ 0xa000_0000 0xbfff_ffff PCI2/PEX2 MEM 512M
+ 0xffe0_0000 0xffef_ffff CCSR 1M
+ 0xffdf_0000 0xffdf_7fff PIXIS 8K
+ 0xffdf_8000 0xffdf_ffff CF 8K
+ 0xf840_0000 0xf840_3fff Stack space 32K
+ 0xffc0_0000 0xffc0_ffff PCI1/PEX1 IO 64K
+ 0xffc1_0000 0xffc1_ffff PCI2/PEX2 IO 64K
+ 0xef80_0000 0xefff_ffff Flash 8M
+
+For 36-bit-enabled u-boot, the virtual map is the same as for 32-bit.
+However, the physical map is altered to reside in 36-bit space, as follows.
+Addresses are no longer mapped with VA == PA. All accesses from
+software use the VA; the PA is only used for setting up windows
+and mappings. Note that with the exception of PCI MEM and RIO, the low
+ 32 bits are the same as the VA above; only the top 4 bits vary:
+
+ Memory Range Device Size
+ ------------ ------ ----
+ 0x0_0000_0000 0x0_7fff_ffff DDR 2G
+ 0xc_0000_0000 0xc_1fff_ffff RIO MEM 512M
+ 0xc_0000_0000 0xc_1fff_ffff PCI1/PEX1 MEM 512M
+ 0xc_2000_0000 0xc_3fff_ffff PCI2/PEX2 MEM 512M
+ 0xf_ffe0_0000 0xf_ffef_ffff CCSR 1M
+ 0xf_ffdf_0000 0xf_ffdf_7fff PIXIS 8K
+ 0xf_ffdf_8000 0xf_ffdf_ffff CF 8K
+ 0x0_f840_0000 0xf_f840_3fff Stack space 32K
+ 0xf_ffc0_0000 0xf_ffc0_ffff PCI1/PEX1 IO 64K
+ 0xf_ffc1_0000 0xf_ffc1_ffff PCI2/PEX2 IO 64K
+ 0xf_ef80_0000 0xf_efff_ffff Flash 8M
+
+5. pixis_reset command
+--------------------
+A new command, "pixis_reset", is introduced to reset mpc8641hpcn board
+using the FPGA sequencer. When the board restarts, it has the option
+of using either the current or alternate flash bank as the boot
+image, with or without the watchdog timer enabled, and finally with
+or without frequency changes.
+
+Usage is;
+
+ pixis_reset
+ pixis_reset altbank
+ pixis_reset altbank wd
+ pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
+ pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
+
+Examples;
+
+ /* reset to current bank, like "reset" command */
+ pixis_reset
+
+ /* reset board but use the to alternate flash bank */
+ pixis_reset altbank
+
+ /* reset board, use alternate flash bank with watchdog timer enabled*/
+ pixis_reset altbank wd
+
+ /* reset board to alternate bank with frequency changed.
+ * 40 is SYSCLK, 2.5 is COREPLL ratio, 10 is MPXPLL ratio
+ */
+ pixis-reset altbank cf 40 2.5 10
+
+Valid clock choices are in the 8641 Reference Manuals.
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