On Classic, IRAM1 (second 128Kb of a total of 256KB available IRAM) is slower than DRAM. Codecs that actually are using regions of IRAM1 runs faster when DRAM is used, so IRAM1 is disabled and only IRAM0 remains enabled: 48KB for core and 80KB for codecs/plugins.
The next test_codec results shows how decode time is decreased:
8f38f85: Workaround for usb_storage_init_connection() panic
For s5l8701, s5l8702 and as3525v2 targets.
The crash occurs when USB is inserted or extracted while the playlist is being loaded or updated (it could take a few seconds for huge playlists), at this point all buflib memory is allocated and not freed before usb_starage_init_connection() is executed.
This workaround mitigates this panic by using static memory for USB buffers, so this memory cannot be used for other tasks, in addition the problem still persist when playlist load is 'paused' by USB insertion and then updated after USB extraction.