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a47a12becf
As discussed on the list, move "arch/ppc" to "arch/powerpc" to better match the Linux directory structure. Please note that this patch also changes the "ppc" target in MAKEALL to "powerpc" to match this new infrastructure. But "ppc" is kept as an alias for now, to not break compatibility with scripts using this name. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Wolfgang Denk <wd@denx.de> Acked-by: Detlev Zundel <dzu@denx.de> Acked-by: Kim Phillips <kim.phillips@freescale.com> Cc: Peter Tyser <ptyser@xes-inc.com> Cc: Anatolij Gustschin <agust@denx.de>
171 lines
4.5 KiB
Text
171 lines
4.5 KiB
Text
HCU5 configuration details and startup sequence
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(C) Copyright 2007 Netstal Maschinen AG
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Niklaus Giger (Niklaus.Giger@netstal.com)
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TODO:
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-----
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- Fix error: Waiting for PHY auto negotiation to complete..... TIMEOUT !
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- Does not occur if both EMAC are connected
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- Fix RTS/CTS problem (HW?)
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CONFIG_SERIAL_MULTI/CONFIG_SERIAL_SOFTWARE_FIFO hangs after
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Switching to interrupt driven serial input mode
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Caveats:
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--------
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Errata CHIP_8: Incorrect Write to DDR SDRAM. (was not applied to sequoia.c)
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see hcu5.c.
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Memory Bank 0 -- Flash chip
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---------------------------
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0xfff00000 - 0xffffffff
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The flash chip is really only 512Kbytes, but the high address bit of
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the 1Meg region is ignored, so the flash is replicated through the
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region. Thus, this is consistent with a flash base address 0xfff80000.
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The placement at the end is to be consistent with reset behavior,
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where the processor itself initially uses this bus to load the branch
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vector and start running.
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On-Chip Memory
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--------------
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0xe0010000- 0xe0013fff CONFIG_SYS_OCM_BASE
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The 440EPx includes a 16K on-chip memory that can be placed however
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software chooses.
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Internal Peripherals
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--------------------
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0xef600300 - 0xef6008ff
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These are scattered various peripherals internal to the PPC440EPX
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chip.
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Chip-Select 2: Flash Memory
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---------------------------
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Not used
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Chip-Select 3: CAN Interface
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----------------------------
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0xc800000: 2 Intel 82527 CAN-Controller
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Chip-Select 4: IMC-bus standard
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-------------------------------
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0xcc00000: Netstal specific IO-Bus
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Chip-Select 5: IMC-bus fast (inactive)
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--------------------------------------
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0xce00000: Netstal specific IO-Bus (fast, but not yet used)
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Memory Bank 1 -- DDR2
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-------------------------------------
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0x00000000 - 0xfffffff # Default 256 MB
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PCI ??
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USB ??
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Only USB_STORAGE is enabled to load vxWorks
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from a memory stick.
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System-LEDs ??? (Analog zu HCU4 ???)
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Startup sequence
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----------------
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(arch/powerpc/cpu/ppc4xx/resetvec.S)
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depending on configs option
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call _start_440 _start_pci oder _start
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(arch/powerpc/cpu/ppc4xx/start.S)
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_start_440:
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initialize register like
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CCR0
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debug
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setup interrupt vectors
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configure cache regions
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clear and setup TLB
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enable internal RAM
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jump start_ram
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which in turn will jump to start
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_start:
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Clear and set up some registers.
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Debug setup
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Setup the internal SRAM
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Setup the stack in internal SRAM
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setup stack pointer (r1)
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setup GOT
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call cpu_init_f /* run low-level CPU init code (from Flash) */
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call cpu_init_f
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board_init_f: (arch/powerpc/lib\board.c)
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init_sequence defines a list of function to be called
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board_early_init_f: (board/netstal/hcu5/hcu5.c)
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We are using Bootstrap-Option A
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if CPR0_ICFG_RLI_MASK == 0 then set some registers and reboot
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Setup the GPIO pins
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Setup the interrupt controller polarities, triggers, etc.
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Ethernet, PCI, USB enable
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setup BOOT FLASH (Chip timing)
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init_baudrate,
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serial_init
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checkcpu
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misc_init_f #ifdef
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init_func_i2c #ifdef
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post_init_f #ifdef
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init_func_ram -> calls init_dram board/netstal/hcu5/sdram.c
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(EYE function removed!!)
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test_dram call
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* Reserve memory at end of RAM for (top down in that order):
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* - kernel log buffer
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* - protected RAM
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* - LCD framebuffer
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* - monitor code
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* - board info struct
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Save local variables to board info struct
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call relocate_code() does not return
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relocate_code: (arch/powerpc/cpu/ppc4xx/start.S)
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-------------------------------------------------------
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From now on our copy is in RAM and we will run from there,
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starting with board_init_r
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-------------------------------------------------------
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board_init_r: (arch/powerpc/lib\board.c)
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setup bd function pointers
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trap_init
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flash_init: (board/netstal/hcu5/flash.c)
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/* setup for u-boot erase, update */
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setup bd flash info
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cpu_init_r: (arch/powerpc/cpu/ppc4xx/cpu_init.c)
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peripheral chip select in using defines like
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CONFIG_SYS_EBC_PB0A, CONFIG_SYS_EBC_PB0C from hcu5.h
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mem_malloc_init
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malloc_bin_reloc
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spi_init (r or f)??? (CONFIG_ENV_IS_IN_EEPROM)
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env_relocated
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misc_init_r(bd): (board/netstal/hcu5.c)
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ethaddr mit serial number erg<72>nzen
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Then we will somehow go into the command loop
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Most of the HW specific code for the HCU5 may be found in
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include/configs/hcu5.h
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board/netstal/hcu5/*
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arch/powerpc/cpu/ppc4xx/*
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arch/powerpc/lib/*
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include/ppc440.h
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Drivers for serial etc are found under drivers/
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Don't ask question if you did not look at the README !!
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Most CONFIG_SYS_* and CONFIG_* switches are mentioned/explained there.
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