board/netstal/hcu5/README.txt

   1 HCU5 configuration details and startup sequence
   2
   3 (C) Copyright 2007 Netstal Maschinen AG
   4     Niklaus Giger (Niklaus.Giger@netstal.com)
   5
   6 TODO:
   7 -----
   8 - Fix error: Waiting for PHY auto negotiation to complete..... TIMEOUT !
   9      - Does not occur if both EMAC are connected
  10 - Fix RTS/CTS problem (HW?)
  11   CONFIG_SERIAL_MULTI/CONFIG_SERIAL_SOFTWARE_FIFO hangs after
  12   Switching to interrupt driven serial input mode
  13
  14 Caveats:
  15 --------
  16 Errata CHIP_8: Incorrect Write to DDR SDRAM. (was not applied to sequoia.c)
  17 see hcu5.c.
  18
  19
  20 Memory Bank 0 -- Flash chip
  21 ---------------------------
  22
  23 0xfff00000 - 0xffffffff
  24
  25 The flash chip is really only 512Kbytes, but the high address bit of
  26 the 1Meg region is ignored, so the flash is replicated through the
  27 region. Thus, this is consistent with a flash base address 0xfff80000.
  28
  29 The placement at the end is to be consistent with reset behavior,
  30 where the processor itself initially uses this bus to load the branch
  31 vector and start running.
  32
  33 On-Chip Memory
  34 --------------
  35
  36 0xe0010000- 0xe0013fff   CONFIG_SYS_OCM_BASE
  37 The 440EPx includes a 16K on-chip memory that can be placed however
  38 software chooses.
  39
  40 Internal Peripherals
  41 --------------------
  42
  43 0xef600300 - 0xef6008ff
  44
  45 These are scattered various peripherals internal to the PPC440EPX
  46 chip.
  47
  48 Chip-Select 2: Flash Memory
  49 ---------------------------
  50
  51 Not used
  52
  53 Chip-Select 3: CAN Interface
  54 ----------------------------
  55 0xc800000: 2 Intel 82527 CAN-Controller
  56
  57
  58 Chip-Select 4: IMC-bus standard
  59 -------------------------------
  60
  61 0xcc00000: Netstal specific IO-Bus
  62
  63
  64 Chip-Select 5: IMC-bus fast (inactive)
  65 --------------------------------------
  66
  67 0xce00000: Netstal specific IO-Bus (fast, but not yet used)
  68
  69
  70 Memory Bank 1 -- DDR2
  71 -------------------------------------
  72
  73 0x00000000 - 0xfffffff   # Default 256 MB
  74
  75 PCI ??
  76
  77 USB ??
  78 Only USB_STORAGE is enabled to load vxWorks
  79 from a memory stick.
  80
  81 System-LEDs ??? (Analog zu HCU4 ???)
  82
  83 Startup sequence
  84 ----------------
  85
  86 (cpu/ppc4xx/resetvec.S)
  87 depending on configs option
  88 call _start_440 _start_pci oder _start
  89
  90 (cpu/ppc4xx/start.S)
  91
  92 _start_440:
  93         initialize register like
  94         CCR0
  95         debug
  96         setup interrupt vectors
  97         configure cache regions
  98         clear and setup TLB
  99         enable internal RAM
 100         jump start_ram
 101         which in turn will jump to start
 102 _start:
 103         Clear and set up some registers.
 104         Debug setup
 105         Setup the internal SRAM
 106         Setup the stack in internal SRAM
 107     setup stack pointer (r1)
 108     setup GOT
 109         call cpu_init_f /* run low-level CPU init code     (from Flash) */
 110
 111     call cpu_init_f
 112     board_init_f: (lib_ppc\board.c)
 113         init_sequence defines a list of function to be called
 114             board_early_init_f: (board/netstal/hcu5/hcu5.c)
 115                 We are using Bootstrap-Option A
 116                 if CPR0_ICFG_RLI_MASK == 0 then set some registers and reboot
 117                 Setup the GPIO pins
 118                 Setup the interrupt controller polarities, triggers, etc.
 119                 Ethernet, PCI, USB enable
 120                 setup BOOT FLASH (Chip timing)
 121             init_baudrate,
 122             serial_init
 123             checkcpu
 124             misc_init_f #ifdef
 125             init_func_i2c #ifdef
 126             post_init_f  #ifdef
 127             init_func_ram -> calls init_dram board/netstal/hcu5/sdram.c
 128                 (EYE function removed!!)
 129             test_dram call
 130
 131          * Reserve memory at end of RAM for (top down in that order):
 132          *  - kernel log buffer
 133          *  - protected RAM
 134          *  - LCD framebuffer
 135          *  - monitor code
 136          *  - board info struct
 137         Save local variables to board info struct
 138         call relocate_code() does not return
 139         relocate_code: (cpu/ppc4xx/start.S)
 140 -------------------------------------------------------
 141 From now on our copy is in RAM and we will run from there,
 142         starting with board_init_r
 143 -------------------------------------------------------
 144     board_init_r: (lib_ppc\board.c)
 145         setup bd function pointers
 146         trap_init
 147         flash_init: (board/netstal/hcu5/flash.c)
 148                 /* setup for u-boot erase, update */
 149         setup bd flash info
 150         cpu_init_r: (cpu/ppc4xx/cpu_init.c)
 151             peripheral chip select in using defines like
 152             CONFIG_SYS_EBC_PB0A, CONFIG_SYS_EBC_PB0C from hcu5.h
 153         mem_malloc_init
 154         malloc_bin_reloc
 155         spi_init (r or f)??? (CONFIG_ENV_IS_IN_EEPROM)
 156         env_relocated
 157         misc_init_r(bd): (board/netstal/hcu5.c)
 158             ethaddr mit serial number ergänzen
 159     Then we will somehow go into the command loop
 160
 161 Most of the HW specific code for the HCU5 may be found in
 162 include/configs/hcu5.h
 163 board/netstal/hcu5/*
 164 cpu/ppc4xx/*
 165 lib_ppc/*
 166 include/ppc440.h
 167
 168 Drivers for serial etc are found under drivers/
 169
 170 Don't ask question if you did not look at the README !!
 171 Most CONFIG_SYS_* and CONFIG_* switches are mentioned/explained there.