通过JTAG的系统控制台无法执行master_write_32 -当目标正在运行时，不能这样做吗？
通过JTAG的系统控制台无法执行master_write_32 -当目标正在运行时，不能这样做吗？
提问于 2012-07-22 23:50:48
我有一个用Verilog编写的简单控制器，用于配置Altera的TSE MAC。到目前为止，这是相当简单的。然而，我下一步要做的是设置很多Marvel PHY的设置，同时监控PHY和MAC的统计数据和错误等。在HW中这样做似乎有点过头了，所以我决定集成一个Nios CPU。但在继续并在软件中实现该组件之前，我希望使用系统控制台快速构建该想法的原型。无论如何，这是我的QSys基础系统：
MAC实例被称为tse_mac，其思想是通过CPU的data_master读/写control_port来配置它。
在设置系统并运行之后，我已经使用系统控制台连接到它。我假设它通常是有效的，因为它能够获取master服务路径：
% get_service_paths master
{/devices/EP2AGX260@1#7-1/(link)/JTAG/(70:34 v3 #0)/nios2_0}它也可以很好地打开。但是，当尝试写入32位值时，它会立即失败：
% get_service_paths master
{/devices/EP2AGX260@1#7-1/(link)/JTAG/(70:34 v3 #0)/nios2_0}
% open_service master "/devices/EP2AGX260@1#7-1/(link)/JTAG/(70:34 v3 #0)/nios2_0"
% master_write_32 "/devices/EP2AGX260@1#7-1/(link)/JTAG/(70:34 v3 #0)/nios2_0" 0x400 0x00000000;
error: com.altera.systemconsole.internal.plugin.jtag.oci.Nios2DebugException: Can't do this while target is running
while executing
"master_write_32 {/devices/EP2AGX260@1#7-1/(link)/JTAG/(70:34 v3 #0)/nios2_0} {0x400} {0x00000000}"
while executing
"master_write_32 "/devices/EP2AGX260@1#7-1/(link)/JTAG/(70:34 v3 #0)/nios2_0" 0x400 0x00000000"
% 以下是例外情况：
Jul 22, 2012 12:17:39 PM com.altera.systemconsole.internal.core.SystemConsole logSevere
SEVERE: com.altera.systemconsole.internal.plugin.jtag.oci.Nios2DebugException: Can't do this while target is running
java.util.concurrent.ExecutionException: com.altera.systemconsole.internal.plugin.jtag.oci.Nios2DebugException: Can't do this while target is running
at com.altera.systemconsole.internal.core.SimpleFuture$Sync.innerGet(SimpleFuture.java:169)
at com.altera.systemconsole.internal.core.SimpleFuture.get(SimpleFuture.java:66)
at com.altera.systemconsole.scripting.StandardCommandSet.waitForFutureResponse(StandardCommandSet.java:233)
at com.altera.systemconsole.scripting.StandardCommandSet.peekMemoryService(StandardCommandSet.java:161)
at com.altera.systemconsole.scripting.StandardCommandSet.readByte(StandardCommandSet.java:120)
at com.altera.systemconsole.scripting.ScriptEngine$16.execute(ScriptEngine.java:1117)
at com.altera.systemconsole.scripting.ScriptEngine$LegacyCommandAdapter.execute2(ScriptEngine.java:199)
at com.altera.systemconsole.scripting.SystemConsoleThreadTCLInterpreter$2$1.run(SystemConsoleThreadTCLInterpreter.java:181)
at com.altera.systemconsole.internal.core.SystemExecutor$4.run(SystemExecutor.java:516)
at com.altera.systemconsole.internal.core.SystemExecutor$ComparableTask.run(SystemExecutor.java:148)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.altera.systemconsole.internal.plugin.jtag.oci.Nios2DebugException: Can't do this while target is running
at com.altera.systemconsole.internal.plugin.jtag.oci.Nios2Debug.readMemoryIndirect(Native Method)
at com.altera.systemconsole.internal.plugin.jtag.oci.Nios2Debug.readMemory(Nios2Debug.java:186)
at com.altera.systemconsole.internal.plugin.jtag.oci.OciMemoryService.peek(OciMemoryService.java:158)
at com.altera.systemconsole.internal.core.legacymaster.LegacyMasterChannel$1.run(LegacyMasterChannel.java:88)
at com.altera.systemconsole.internal.core.SystemExecutor.addTaskIfNecessary(SystemExecutor.java:536)
at com.altera.systemconsole.internal.core.legacymaster.LegacyMasterChannel.doReadMemory(LegacyMasterChannel.java:77)
at com.altera.systemconsole.internal.core.legacymaster.LegacyMasterChannel.readMemory(LegacyMasterChannel.java:69)
at com.altera.systemconsole.scripting.StandardCommandSet.peekMemoryService(StandardCommandSet.java:157)
... 9 more我以前从来没有使用过系统控制台，在互联网或手册中找不到任何相关的东西。所以问题是--我做了什么错事？任何帮助解决这个问题的人都会很感激。
回答 1
Stack Overflow用户
回答已采纳
发布于 2012-07-25 04:25:45
该异常意味着您必须暂停/停止CPU才能执行master_write_32。要使CPU保持运行，必须使用JTAG to Avalon Master Bridge。它将作为另一个服务(即索引为1)导出，并可用于与Avalon MM组件进行通信。答案归功于guys at Altera's forum。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/11601699
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