EEPW论坛

问 使用了MX1的片选CS5，读访问是用普通模式，正常。
现在需要使用其写访问的DTACK#模式，据其资料介绍，
写访问是完全支持DTACK#模式的，但我还是碰到了问题，
即超过应答时间（1024个系统时钟）时，MX1产生bus error，
并将此error通知CPU，问题在于我不知道如何获知此error在
cpu内部处理的机制以及如何撤销，比如但产生该类错误时，
让CPU放弃处理此error，丢弃此次写访问。（不知这是不是我
自己的愿意而已，因为本人对操作系统不熟悉）。出现崩溃时，
系统控制台显示如下：

Unhandled fault: external abort on non-linefetch (0x028) at 0xf6000000  

                                                                    

pgd = c2e94000              
*pgd = 16000442, *pmd = 16000442(bad)                                   

  
Internal error: Oops: 0                       
CPU: 0      
pc : [<c403c194>]    lr : [<0000ffff>]    Not tainted                   

                                  
sp : c2dc7b44  ip : 0000ffff  fp : bffffe6c                             

              
r10: 40137a28  r9 : c2dc6000  r8 : bffffe70                             

              
r7 : 00000000  r6 : 0000ffff  r5 : 00000000  r4 : f6000000              

                                            
r3 : f6000000  r2 : 0000ffff  r1 : ffff0000  r0 : 0000ffff              

                                            
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  Segment user                

                                        
Control: C000317F  Table: 0AE94000  DAC: 0000                           

                 
Process pc104test (pid: 58, stackpage=c2dc7000)                         

                      
Stack: (0xc2dc7b34 to 0xc2dc8000)
#......(此处显示杂乱的数据，如下，我猜测其是某内存区域的内容)
7b20:                                              0000ffff c403c194

80000013                                                                

             
7b40: ffffffff c403c284 c2dc7f78 c00188a0 ffffffea c403c2ec 00000000

00000000                                                                

             
7b60: 00000000 00000020 00000000 c2dc7b78 f6000000 c403c78c ffffffff

ffffffff                                                                

             
7b80: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff 00000000

00000000                                                                

             
7ba0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7bc0: 00000000 00000000 00000000 00000000 00                            

              
7be0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7c00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7c20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7c40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7c60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7c80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7ca0: 00000000 00000000 00000000 00000000 00000                         

                     
7cc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7ce0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7d00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7d20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7d40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000                                                                

             
7d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000   
7d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7dc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7de0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7e60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7e80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7ec0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7f20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000

00000000
7f60: 00000000 00000000 00000000 00000000 00000000 00000000 c00188c0

00000020
7f80: bffffe70 c00188a0 00000020 c0044440 fffffffe c014e0c0 00000003

00000020
7fa0: bffffe70 00000004 c001ae04 c001ac80 00000003 c001ab24 00000003

bffffe70
7fc0: 00000020 fbad2a84 00000003 00000020 bffffe70 00000001 02000584

401373b4
7fe0: 40137a28 bffffe6c 400e1e50 bffffe54 02000544 400e1e54 60000010

00000003
Backtrace: invalid frame pointer 0xbffffe6c
Code: e1a03001 e1a01802 e1a0c821 e1a0e00c (e1c3e0b0)
Segmentation fault

#.......(当写访问到cs5的区域时，出现以上错误提示，然后系统崩溃！) 答 1: 回复主题：使用MX1（龙珠）片选cs5系统崩溃，请大侠出招！使用linux操作系统，内核版本号：2.4.18