diff options
Diffstat (limited to 'openpcd/firmware/doc/dfu.txt')
| -rw-r--r-- | openpcd/firmware/doc/dfu.txt | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/openpcd/firmware/doc/dfu.txt b/openpcd/firmware/doc/dfu.txt deleted file mode 100644 index 9b40c3c..0000000 --- a/openpcd/firmware/doc/dfu.txt +++ /dev/null @@ -1,89 +0,0 @@ -- data that is needed from both app and dfu mode -- code that is needed from both app and dfu mode - - function pointers - - copy code to RAM in case of DFU switch -- data that is only needed in DFU mode - - can be overwritten in case of reset-to-application -- data that is only needed in app mode - - can be overwritten with DFU data in case of DFU switch -- code that is only needed in DFU mode - - has to be copied to ram in case of DFU switch -- code that is only needed in app mode - - can be read from flash, no action required - - -=> abandoned that complicated idea. -now all DFU functions are __ramfunc's and thus always present. - - -interaction between app and dfu code: - -- dfu_switch(void) -- dfu_status (can be put in accessor function, if required) -- dfu_cfg_descriptor -- dfu_dev_descriptor -- dfu_ep0_handler() - - -order of events at boot; - -- start at reset vector in flash - - AT91F_LowLevelInit() -- setup stack for each mode -- relocate 'data' of bootloader, including ramfunc/vectram -- clear 'bss' of bootloader -- call remap command - - call usb initialization (irq, clock) - - if keypress, - - call dfu_main() - - wait for ep0 / busreset interrupt - - else call main() - - -memory layout: - -0: lowlevel startup code - Cstartup.o 0x00bc - Cstartup_SAM7.o 0x0100 - dfufunc 0x1dcc - dfustruct 0x0038 - - text text 0x0070 -data data 0x0000 -bss bss 0x000c - -flash = text + data (= 8k) -ram/rel = data + bss (12 bytes) - - -If we drop the DFU-can-flash-DFU requirement, we can leave all DFU related code -in flash. no need for any function to be permanently in RAM. However, not -preventing this feature in some future version, we shouldn't do that. - - -Function DFU runtime -udp_init x x RAM -udp_ep0_send_data x x RAM -udp_ep0_send_zlp x x RAM -udp_sp0_send_stall x x RAM -handle_dnload x - flash/relocated -handle_upload x - flash/relocated -handle_getstatus x - flash/relocated -handle_getstate x - flash/relocated -dfu_ep0_handler x x RAM - -dfu_dev_descriptor x - flash/relocated -dfu_cfg_descriptor x - flash/relocated -dfu_udp_ep0_handler x - flash/relocated -dfu_udp_irq x - flash/relocated -dfu_switch - x RAM -dfu_main x - flash/relocated -vectram x x flash/relocated/switched -IRQ_Handler_EntryR x x flash/relocated/switched -_remap x - flash/reloaded - -dfu_api x x flash (const anyway) -dfu_state x x RAM - - - |