| HCU5 configuration details and startup sequence |
| |
| (C) Copyright 2007 Netstal Maschinen AG |
| Niklaus Giger (Niklaus.Giger@netstal.com) |
| |
| TODO: |
| ----- |
| - Fix error: Waiting for PHY auto negotiation to complete..... TIMEOUT ! |
| - Does not occur if both EMAC are connected |
| - Fix RTS/CTS problem (HW?) |
| CONFIG_SERIAL_MULTI/CONFIG_SERIAL_SOFTWARE_FIFO hangs after |
| Switching to interrupt driven serial input mode |
| |
| Caveats: |
| -------- |
| Errata CHIP_8: Incorrect Write to DDR SDRAM. (was not applied to sequoia.c) |
| see hcu5.c. |
| |
| |
| Memory Bank 0 -- Flash chip |
| --------------------------- |
| |
| 0xfff00000 - 0xffffffff |
| |
| The flash chip is really only 512Kbytes, but the high address bit of |
| the 1Meg region is ignored, so the flash is replicated through the |
| region. Thus, this is consistent with a flash base address 0xfff80000. |
| |
| The placement at the end is to be consistent with reset behavior, |
| where the processor itself initially uses this bus to load the branch |
| vector and start running. |
| |
| On-Chip Memory |
| -------------- |
| |
| 0xe0010000- 0xe0013fff CONFIG_SYS_OCM_BASE |
| The 440EPx includes a 16K on-chip memory that can be placed however |
| software chooses. |
| |
| Internal Peripherals |
| -------------------- |
| |
| 0xef600300 - 0xef6008ff |
| |
| These are scattered various peripherals internal to the PPC440EPX |
| chip. |
| |
| Chip-Select 2: Flash Memory |
| --------------------------- |
| |
| Not used |
| |
| Chip-Select 3: CAN Interface |
| ---------------------------- |
| 0xc800000: 2 Intel 82527 CAN-Controller |
| |
| |
| Chip-Select 4: IMC-bus standard |
| ------------------------------- |
| |
| 0xcc00000: Netstal specific IO-Bus |
| |
| |
| Chip-Select 5: IMC-bus fast (inactive) |
| -------------------------------------- |
| |
| 0xce00000: Netstal specific IO-Bus (fast, but not yet used) |
| |
| |
| Memory Bank 1 -- DDR2 |
| ------------------------------------- |
| |
| 0x00000000 - 0xfffffff # Default 256 MB |
| |
| PCI ?? |
| |
| USB ?? |
| Only USB_STORAGE is enabled to load vxWorks |
| from a memory stick. |
| |
| System-LEDs ??? (Analog zu HCU4 ???) |
| |
| Startup sequence |
| ---------------- |
| |
| (cpu/ppc4xx/resetvec.S) |
| depending on configs option |
| call _start_440 _start_pci oder _start |
| |
| (cpu/ppc4xx/start.S) |
| |
| _start_440: |
| initialize register like |
| CCR0 |
| debug |
| setup interrupt vectors |
| configure cache regions |
| clear and setup TLB |
| enable internal RAM |
| jump start_ram |
| which in turn will jump to start |
| _start: |
| Clear and set up some registers. |
| Debug setup |
| Setup the internal SRAM |
| Setup the stack in internal SRAM |
| setup stack pointer (r1) |
| setup GOT |
| call cpu_init_f /* run low-level CPU init code (from Flash) */ |
| |
| call cpu_init_f |
| board_init_f: (lib_ppc\board.c) |
| init_sequence defines a list of function to be called |
| board_early_init_f: (board/netstal/hcu5/hcu5.c) |
| We are using Bootstrap-Option A |
| if CPR0_ICFG_RLI_MASK == 0 then set some registers and reboot |
| Setup the GPIO pins |
| Setup the interrupt controller polarities, triggers, etc. |
| Ethernet, PCI, USB enable |
| setup BOOT FLASH (Chip timing) |
| init_baudrate, |
| serial_init |
| checkcpu |
| misc_init_f #ifdef |
| init_func_i2c #ifdef |
| post_init_f #ifdef |
| init_func_ram -> calls init_dram board/netstal/hcu5/sdram.c |
| (EYE function removed!!) |
| test_dram call |
| |
| * Reserve memory at end of RAM for (top down in that order): |
| * - kernel log buffer |
| * - protected RAM |
| * - LCD framebuffer |
| * - monitor code |
| * - board info struct |
| Save local variables to board info struct |
| call relocate_code() does not return |
| relocate_code: (cpu/ppc4xx/start.S) |
| ------------------------------------------------------- |
| From now on our copy is in RAM and we will run from there, |
| starting with board_init_r |
| ------------------------------------------------------- |
| board_init_r: (lib_ppc\board.c) |
| setup bd function pointers |
| trap_init |
| flash_init: (board/netstal/hcu5/flash.c) |
| /* setup for u-boot erase, update */ |
| setup bd flash info |
| cpu_init_r: (cpu/ppc4xx/cpu_init.c) |
| peripheral chip select in using defines like |
| CONFIG_SYS_EBC_PB0A, CONFIG_SYS_EBC_PB0C from hcu5.h |
| mem_malloc_init |
| malloc_bin_reloc |
| spi_init (r or f)??? (CONFIG_ENV_IS_IN_EEPROM) |
| env_relocated |
| misc_init_r(bd): (board/netstal/hcu5.c) |
| ethaddr mit serial number ergänzen |
| Then we will somehow go into the command loop |
| |
| Most of the HW specific code for the HCU5 may be found in |
| include/configs/hcu5.h |
| board/netstal/hcu5/* |
| cpu/ppc4xx/* |
| lib_ppc/* |
| include/ppc440.h |
| |
| Drivers for serial etc are found under drivers/ |
| |
| Don't ask question if you did not look at the README !! |
| Most CONFIG_SYS_* and CONFIG_* switches are mentioned/explained there. |
