Sometimes descriptor string 0xee is requested.
This is a mechanism used by Microsoft Windows to further identify the USB device.
Instead of stalling, as is the original code, leading to an USB reset, we send an empty packet.
I am not sure if sending an empty string would be better, but an empty packet seems sufficient.
During DFU download the destination start address is checked to not exceed the
RAM or flash end address, but it is also necessary to check if the end of the
data to be downloaded is also within the allowed range.
When downloading to RAM it is also necessary to check if the data to be
downloaded does not overwrite (i.e. corrupt) the stack.
fixes following warning:
libboard/common/source/board_cstartup_gnu.c:137:11: warning: assignment to 'void (*)(void)' from 'unsigned int' makes pointer from integer without a cast [-Wint-conversion]
appReset = pSrc[1];
the __attribute__ ((format (printf, 1, 0))) declaration remove the following
compilation warning:
warning: function 'osmo_panic' might be a candidate for 'gnu_printf' format
attribute [-Wsuggest-attribute=format]
osmo_panic_default(fmt, args);
The original board startup script is provided by Atmel.
It has been modified to handle application or DFU booting.
The copyright notice has been updated to reflect this change.
Kévin Redon