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Diffstat (limited to 'board/netstal/hcu5/README.txt')
| -rw-r--r-- | board/netstal/hcu5/README.txt | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/board/netstal/hcu5/README.txt b/board/netstal/hcu5/README.txt new file mode 100644 index 00000000000..3118da9e06e --- /dev/null +++ b/board/netstal/hcu5/README.txt @@ -0,0 +1,174 @@ +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 +- Make vxWorks start from u-boot. Possible reasons + - Does vxWorks need an entry for the Machine Check interrupt like this + tlbentry( 0x40000000, SZ_256M, 0, 1, AC_R|AC_W|AC_X|SA_G|SA_I ) ? + +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 CFG_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 + CFG_EBC_PB0A, CFG_EBC_PB0C from hcu5.h + mem_malloc_init + malloc_bin_reloc + spi_init (r or f)??? (CFG_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 CFG_* and CONFIG_* switches are mentioned/explained there. |