| The HAL Port | ||
|---|---|---|
 | Chapter 355. Freescale MPC5554DEMO Board Support |  |
Name
HAL Port — Implementation Details
Overview
This documentation explains how the eCos HAL specification has been mapped onto the MPC5554DEMO hardware, and should be read in conjunction with that specification. The MPC5554DEMO platform HAL package complements the PowerPC architectural HAL and the MPC55XX variant HAL. It provides functionality which is specific to the target board.
Startup
Following a hard or soft reset the HAL will initialize or reinitialize most of the on-chip peripherals. There is an exception for RAM startup applications which depend on a ROM monitor for certain services.
For ROM startup, the HAL will perform additional
initialization, setting up the external RAM and programming the
various internal registers. This is all done in the
hal_hardware_init function in the assembler
source file mpc5554demo.S.
Linker Scripts and Memory Maps
The platform HAL package provides the memory layout information needed to generate the linker script. The key memory locations are as follows:
- Flash
- This is located at address 0x00000000 of the physical memory space. It is mapped by the BAM 1-1 to virtual address 0x00000000 with caching enabled, and by eCos to 0x10000000 with caching disabled.
- SRAM
- This is located at address 0x20000000 of the physical memory space. The first 512 bytes are used for the VSR table and the next 256 bytes are normally used for the eCos virtual vectors, allowing RAM-based applications to use services provided by the ROM monitor. The next 512 bytes are used for a shared interrupt state table, recording mask and priority values for each interrupt source. For ROM and JTAG startup, all remaining SRAM is available. For RAM startup, available RAM starts at location 0x00008000, with the bottom 32kiB reserved for use by RedBoot. The SRAM is mapped 1-1 with cache enabled at virtual address 0x20000000 and uncached at 0x30000000.
- on-chip peripherals
- These are available via 1-1 uncached mappings at 0xFFF00000 and 0xC3F00000.
Real-time characterization
The tm_basic kernel test gives statistics gathered about the real-time characterization and performance of the kernel. The sample output is shown here for information.
Example 355.1. mpc5554demo Real-time characterization
Startup, main stack : stack used 708 size 5664
Startup : Interrupt stack used 856 size 4096
Startup : Idlethread stack used 220 size 2048
eCos Kernel Timings
Notes: all times are in microseconds (.000001) unless otherwise stated
Reading the hardware clock takes 13 'ticks' overhead
... this value will be factored out of all other measurements
Clock interrupt took 6.71 microseconds (858 raw clock ticks)
Testing parameters:
Clock samples: 32
Threads: 17
Thread switches: 128
Mutexes: 32
Mailboxes: 32
Semaphores: 32
Scheduler operations: 128
Counters: 32
Flags: 32
Alarms: 32
Confidence
Ave Min Max Var Ave Min Function
====== ====== ====== ====== ========== ========
17.12 15.38 34.45 2.10 94% 88% Create thread
1.33 1.22 3.09 0.21 94% 94% Yield thread [all suspended]
1.97 1.52 6.89 0.63 94% 88% Suspend [suspended] thread
1.53 1.13 7.45 0.70 94% 94% Resume thread
1.91 1.72 3.33 0.17 52% 41% Set priority
0.09 0.07 0.48 0.05 94% 94% Get priority
5.12 3.79 22.52 2.05 94% 94% Kill [suspended] thread
1.37 1.22 3.71 0.28 94% 94% Yield [no other] thread
2.25 2.00 6.18 0.46 94% 94% Resume [suspended low prio] thread
1.18 1.14 1.88 0.08 94% 94% Resume [runnable low prio] thread
1.65 1.52 3.00 0.21 82% 82% Suspend [runnable] thread
1.58 1.22 7.39 0.68 94% 94% Yield [only low prio] thread
1.14 1.10 1.69 0.06 94% 94% Suspend [runnable->not runnable]
4.23 3.61 11.97 0.92 94% 94% Kill [runnable] thread
3.71 2.78 15.52 1.39 94% 94% Destroy [dead] thread
5.83 5.39 12.48 0.78 94% 94% Destroy [runnable] thread
13.28 10.80 26.84 2.26 82% 88% Resume [high priority] thread
2.69 2.59 12.10 0.19 98% 98% Thread switch
0.05 0.04 1.36 0.02 99% 99% Scheduler lock
0.85 0.84 1.98 0.02 99% 99% Scheduler unlock [0 threads]
0.84 0.84 0.98 0.00 99% 99% Scheduler unlock [1 suspended]
0.84 0.84 0.98 0.00 99% 99% Scheduler unlock [many suspended]
0.85 0.84 1.07 0.00 99% 99% Scheduler unlock [many low prio]
0.86 0.16 3.54 0.17 87% 6% Init mutex
1.76 1.39 7.95 0.39 96% 96% Lock [unlocked] mutex
2.00 1.58 15.00 0.81 96% 96% Unlock [locked] mutex
1.41 1.21 7.68 0.39 96% 96% Trylock [unlocked] mutex
1.16 1.10 2.88 0.11 96% 96% Trylock [locked] mutex
0.16 0.15 0.55 0.02 96% 96% Destroy mutex
8.00 7.90 10.75 0.19 93% 93% Unlock/Lock mutex
1.29 0.33 13.13 0.74 90% 96% Create mbox
0.87 0.20 2.05 0.74 59% 59% Peek [empty] mbox
1.97 1.52 13.41 0.72 96% 96% Put [first] mbox
0.03 0.02 0.60 0.04 96% 96% Peek [1 msg] mbox
1.58 1.52 3.07 0.10 93% 93% Put [second] mbox
0.03 0.02 0.44 0.03 96% 96% Peek [2 msgs] mbox
2.26 1.65 19.64 1.09 96% 96% Get [first] mbox
1.78 1.65 3.17 0.18 90% 68% Get [second] mbox
1.42 1.28 5.59 0.26 96% 96% Tryput [first] mbox
1.42 1.30 5.07 0.23 96% 96% Peek item [non-empty] mbox
1.53 1.42 5.02 0.22 96% 96% Tryget [non-empty] mbox
1.27 1.24 1.85 0.05 93% 93% Peek item [empty] mbox
1.33 1.27 3.45 0.13 96% 96% Tryget [empty] mbox
0.10 0.05 1.82 0.11 96% 96% Waiting to get mbox
0.07 0.05 0.46 0.04 93% 93% Waiting to put mbox
0.42 0.34 3.06 0.17 96% 96% Delete mbox
5.90 5.57 13.93 0.62 93% 93% Put/Get mbox
0.46 0.15 1.38 0.08 84% 12% Init semaphore
1.13 1.04 1.82 0.13 90% 71% Post [0] semaphore
1.30 1.25 1.64 0.08 87% 87% Wait [1] semaphore
1.17 1.09 3.89 0.17 96% 96% Trywait [0] semaphore
1.04 1.04 1.23 0.01 96% 96% Trywait [1] semaphore
0.18 0.15 1.05 0.05 96% 96% Peek semaphore
0.17 0.15 0.73 0.04 96% 96% Destroy semaphore
5.01 4.98 5.89 0.06 96% 96% Post/Wait semaphore
1.02 0.24 4.36 0.21 90% 6% Create counter
0.69 0.06 3.77 0.66 78% 78% Get counter value
0.07 0.04 1.02 0.06 96% 96% Set counter value
1.31 1.26 1.85 0.09 84% 84% Tick counter
0.18 0.15 1.30 0.07 96% 96% Delete counter
0.50 0.15 1.72 0.09 87% 6% Init flag
1.46 1.23 6.98 0.34 96% 96% Destroy flag
1.08 1.02 3.10 0.13 96% 96% Mask bits in flag
1.37 1.22 6.13 0.30 96% 96% Set bits in flag [no waiters]
1.96 1.70 10.25 0.52 96% 96% Wait for flag [AND]
1.65 1.63 2.24 0.04 96% 96% Wait for flag [OR]
1.71 1.70 2.16 0.03 96% 96% Wait for flag [AND/CLR]
1.64 1.63 1.96 0.02 96% 96% Wait for flag [OR/CLR]
0.00 0.00 0.00 0.00 100% 100% Peek on flag
2.24 0.68 11.62 0.59 93% 3% Create alarm
3.04 2.24 14.94 0.97 87% 84% Initialize alarm
1.14 1.03 4.33 0.20 96% 96% Disable alarm
2.09 1.83 9.42 0.47 96% 96% Enable alarm
1.33 1.22 4.84 0.22 96% 96% Delete alarm
1.53 1.41 5.14 0.23 96% 96% Tick counter [1 alarm]
7.59 7.47 11.20 0.23 96% 96% Tick counter [many alarms]
2.49 2.44 4.22 0.11 96% 96% Tick & fire counter [1 alarm]
44.24 44.22 44.78 0.03 96% 96% Tick & fire counters [>1 together]
8.64 8.62 9.40 0.05 96% 96% Tick & fire counters [>1 separately]
5.57 5.53 8.68 0.05 99% 99% Alarm latency [0 threads]
6.86 5.54 7.84 0.58 67% 32% Alarm latency [2 threads]
6.85 5.53 11.23 0.67 76% 19% Alarm latency [many threads]
10.28 10.05 31.93 0.44 97% 97% Alarm -> thread resume latency
1.12 1.08 6.98 0.00 Clock/interrupt latency
2.77 2.26 12.51 0.00 Clock DSR latency
635 604 665 (main stack: 1244) Thread stack used (1704 total)
All done, main stack : stack used 1244 size 5664
All done : Interrupt stack used 288 size 4096
All done : Idlethread stack used 617 size 2048
Timing complete - 30880 ms total
PASS:<Basic timing OK>
EXIT:<done>Other Issues
The MPC5554DEMO platform HAL does not affect the implementation of other parts of the eCos HAL specification. The MPC55XX variant HAL, and the PowerPC architectural HAL documentation should be consulted for further details.
| |  | |
| JTAG debugging support |  | Chapter 356. MPC8309KIT Board Support |
| 2024-12-10 | eCosPro Non-Commercial Public License |