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Diffstat (limited to 'arch/arm/mach-arm.dox')
| -rw-r--r-- | arch/arm/mach-arm.dox | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/arch/arm/mach-arm.dox b/arch/arm/mach-arm.dox deleted file mode 100644 index 1d2de48df2..0000000000 --- a/arch/arm/mach-arm.dox +++ /dev/null @@ -1,67 +0,0 @@ -/* This document is intended to provide the developer with information - * how to integrate a new CPU (MACH) into this part of the barebox tree - */ - -/** @page dev_arm_mach ARM based CPU (MACH) into the tree - -FIXME - -@section mach_arm_reset What's happens when the reset signal is gone - -@note Code running immediately after reset runs at an address it is not linked - to: "runtime address != link address". You should only use branches and - do not refer to fixed data. This implies the use of assembler code only. - -The ARM CPU starts at lable \<reset\> in one of the corresponding start-*.S -files. After some basic hardware setup it can call a function -\<arch_init_lowlevel\> if not disabled. This call is intended to give all -developers a chance to use a standard reset vector file, but also do some -special things required only on their specific CPU. - -After handling some MMU related things \<board_init_lowlevel\> can be called (if -not disabled). This is a board specific function for SDRAM setup for example. -As its board specific, your can do whatever you need to bring your board up. - -In the case the boot happens from NAND flash memory, further steps are required. -Most of the known processor devices are reading the first few blocks from the -NAND flash memory into some kind of internal SRAM. This small part must be able -to initialize the SDRAM controller and to read the remaining rest of the -barebox binary from the NAND flash memory prior returning from \<board_init_lowlevel\>. - -When \<board_init_lowlevel\> returns it will be assumed there is now a working -RAM that can be used for all further steps. - -Next step is relocation of @a barebox itself (if not already done). It gets copied -to RAM and the last assembler instruction is a jump into start_barebox(). This -target address is the first C instruction in barebox. At this point of time:\n -"runtime address == link address". - -@section mach_arm_files List of changes - -Lets call the new MACH new_cpu. - - - create a new subdirectory in /arch/arm/mach-new_cpu - - create a new subdirectory in /arch/arm/mach-new_cpu/include - - add CPU specific definitions into /arch/arm/mach-new_cpu/include - - add /arch/arm/mach-new_cpu/Kconfig - - add /arch/arm/mach-new_cpu/Makfile - - add other CPU specific code into /arch/arm/mach-new_cpu/ - - modify /arch/arm/Kconfig - - modify /arch/arm/Makfile - -@section mach_arm_architecures Architectures using ARM processors -For details on specific architectures: - -@subsection mach_arm_omap_info OMAP CPUs - -@li @subpage dev_davinci_arch - -@li @subpage dev_omap_arch - -@subsection mach_arm_s3c24xx_info S3C24XX CPUs - -@li @subpage dev_s3c24xx_arch - -TODO add more details - -*/ |