1 / 28 Multi-OS Project National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu Presenter: Tang-Hsun Tu How to work with Multi-OS on BF561

2 / 28 ◇ Loader File Structure  Outlines ○ Introduction ◇ Multi-DXE Loader ○ Multi-OS ○ Communication National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu ○ Conclusion ○ Further Work ◇ Second Stage Loader

3 / 28 ◇ Loader File Structure  Outlines ○ Introduction ◇ Multi-DXE Loader ○ Multi-OS ○ Communication National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu ○ Conclusion ○ Further Work ◇ Second Stage Loader

4 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Motivation 1.a porting uC/OS-II dxe 2.System Architecture

5 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Motivation (Cont.)

6 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Compiler / Linker / Loader. o(s ). lds. ldf executable. doj(s ). dxe(s ) Visual DSP++ Linux

7 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Loader File and Flash

8 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Second Stage Loader Management of Two dxe(s)

9 / 28 ◇ Loader File Structure  Outlines ○ Introduction ◇ Multi-DXE Loader ○ Multi-OS ○ Communication National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu ○ Conclusion ○ Further Work ◇ Second Stage Loader

10 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  BF561 Multi-DXE Loader

11 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Loader File Structure

12 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 1.Address(4 bytes) – the block will be booted within mem 2.Count(4 bytes) – number of bytes in the block 3.Flag(2 bytes) – block type and control commands  10-Byte Header

13 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Loader File With Init -NoFinalTag Single Boot Stream -NoSecondStageKernel

14 / 28  SICA_SYSCR Register National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu How to start coreB ? *pSICA_SYSCR &= 0xFFDF

15 / 28 ◇ Loader File Structure  Outlines ○ Introduction ◇ Multi-DXE Loader ○ Multi-OS ○ Communication National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu ○ Conclusion ○ Further Work ◇ Second Stage Loader

16 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu  Compiler / Linker / Loader. ldf. doj(s ). dxe(s ) Visual DSP++

17 / 28  Linker Section (L2) National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 1.L2_sram: map code and data into L2 for non-multicore parts that have L2 SRAM 2.L2_sram_a: map code and data into the part of L2 memory reserved for core A on a multicore system 3.L2_sram_b: map code and data into the part of L2 memory reserved for core B on a multicore system 4.l2_sram: be used on multicore system to map code and data into L2 for parts which have L2 memory 5.l2_shared: map code and data into the part of L2 memory shared between core A and core B

18 / 28  L2 Share memory National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 0xFEB xFEB xFEB xFEB L2 SRAM A (32K) L2 SRAM (64K) L2_sram_b L2_sram_a l2_shared l2_sram section L2_sramsection 128K L2 SRAM B (32K)

19 / 28  Memory Architecture National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu Core A Memory Core B Memory

20 / 28  Memory Architecture (Cont.) National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu L2 Share Memory (128 K) L3 Share Memory (SDRAM) Max is 256 / 512 MB

21 / 28  Linker Section (SDRAM / L3) National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 1. sdram0: map code or data into external memory, this can be used to place large, infrequently used data or functions into external memory to free up valuable internal memory. 2. sdram_bank {0|1|2|3}: other bank

22 / 28  Synchronization API National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu /* multi-core lock type */ volatile multi_core_lock_t synlock; /* initial function */ 1.void multicore_spin_lock_init_locked(volatile multi_core_lock_t *lockptr); 2.void multicore_spin_lock_init_unlocked(volatile multi_core_lock_t *lockptr); /* function */ 1.void multicore_spin_lock(volatile multi_core_lock_t *lockptr, int cpu_id); 2.void multicore_spin_unlock(volatile multi_core_lock_t *lockptr); 3.void multicore_spin_lock_irqsave(volatile multi_core_lock_t *lockptr, int cpu_id); 4.void multicore_spin_unlock_irqrestore(volatile multi_core_lock_t *lockptr);

23 / 28 ◇ Loader File Structure  Outlines ○ Introduction ◇ Multi-DXE Loader ○ Multi-OS ○ Communication National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu ○ Conclusion ○ Further Work ◇ Second Stage Loader

24 / 28  Conclusion National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 1.We can run multi-uC/OS-II on BF561 2.We can communicate between multicore by L2 share memory

25 / 28 ◇ Loader File Structure  Outlines ○ Introduction ◇ Multi-DXE Loader ○ Multi-OS ○ Communication National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu ○ Conclusion ○ Further Work ◇ Second Stage Loader

26 / 28  Further Work National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 1.Periodic Task 2.Distributed Pinwheel Schedule 3.Synchronization 4.Other OSes

27 / 28  Question National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu 1.Execution Time 2.Floating Point (Sr, DSr) 3.Distance Constrained

28 / 28 National Taiwan University, Graduate Institute of Networking and Multimedia Tang-Hsun Tu