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Re: CB030, A 68030 SBC for hobbyists [message #7269 is a reply to message #7268] Tue, 17 March 2020 09:18 Go to previous messageGo to previous message
mikemac is currently offline  mikemac
Messages: 250
Registered: March 2017
Senior Member
Ah! According to your RAM test, it's good:


?> g 3000                                                                      
64-meg of DRAM longword tested OK                                              
64-meg of DRAM byte tested OK                                                  
64-meg of DRAM longword tested OK                                              
 

With a 16MHz crystal, I still get flaky results when I read the CF into RAM:


T030 ROM BIOS v2.11 (c) 2018 Tobias Rathje                                      
CB030 version ported by Mike McDonald 2020                                      
------------------------------------------                                      
                                                                                
Build: Mar 16 2020 21:24:09                                                     
                                                                                
#> 1                                                                            
 [ Load Linux image into RAM ]                                                  
                                                                                
0%_________________________________________100%                                 
##f_read error: 2                                                               
                                                                                
                                                                                
114688 bytes read                                                               
 [ Stasting Linux ]                                                             
                                                                                
                                                                                
#>


If I put the 24MHz crystal and the 16MB SIMM back in, it's off to the races:


T030 ROM BIOS v2.11 (c) 2018 Tobias Rathje                                      
CB030 version ported by Mike McDonald 2020                                      
------------------------------------------                                      
                                                                                
Build: Mar 16 2020 21:24:09                                                     
                                                                                
#> 1                                                                            
 [ Load Linux image into RAM ]                                                  
                                                                                
0%_________________________________________100%                                 
#################################################                               
                                                                                
2814824 bytes read                                                              
 [ Starting Linux ]                                                             
                                                                                
                                                                                
Bootinfo address: 0x002b1000                                                    
                                                                                
Machine type: 14                                                                
Memory start: 0x00000000                                                        
Memory size: 16 MB                                                              
                                                                                
Loading Linux at 0x00001000                                                     
                                                                                
ABC3GHIJK                                                                       
Linux version 4.9.156-CB030 (mikemac@Altair.mikemac.com) (gcc version 6.1.0 (GC0
bootconsole [cb030serial0] enabled                                              
Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 4060      
Kernel command line: root=/dev/hda2 rw console=ttyS0,38400n8 earlyprintk=ttyS0,0
PID hash table entries: 64 (order: -4, 256 bytes)                               
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)                    
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)                     
Sorting __ex_table...                                                           
Memory: 13420K/16384K available (1861K kernel code, 272K rwdata, 544K rodata, 6)
Virtual kernel memory layout:                                                   
    vector  : 0x0028175c - 0x00281b5c   (   1 KiB)                              
    kmap    : 0xd0000000 - 0xf0000000   ( 512 MiB)                              
    vmalloc : 0x01800000 - 0xd0000000   (3304 MiB)                              
    lowmem  : 0x00000000 - 0x01000000   (  16 MiB)                              
      .init : 0x002a1000 - 0x002b1000   (  64 KiB)                              
      .text : 0x00001000 - 0x001d26d8   (1862 KiB)                              
      .data : 0x001d4b20 - 0x002a0bb0   ( 817 KiB)                              
      .bss  : 0x00281680 - 0x002a0bb0   ( 126 KiB)                              
NR_IRQS:200                                                                     
prandom: fast init done                                                         
random: crng init done  


It's pretty repeatable. I haven't had a load error from the CF if I have the 16MB SIMM in place. The 64MB almost always fails to load the whole 2.8MB Linux kernel image.

Too much current load? Voltage spike? Wrong kind of magic pixie dust? I don't have a clue. So I'll stick to the 16MB SIMM for now.



Mike
 
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