Re: about doc2000 bootstrap without M-system's firmware

Re: about doc2000 bootstrap without M-system's firmware

[jyllyj]

> jyllyj@263.net said:
> > I can see SPL at firmware with offset 0x400,but where is the IPL? at
> > offset 0 looks like DOC2000 hardware initialization.is not so?
>
> Maybe I meant SPL not IPL - I can't remember what M-Systems call it.
>
> But that code initialises the hardware, then reads the 48K firmware off
the
> flash, and jumps to it if its checksum is right.
>
I find IPL at D000:0 with your jump's setuping
it is :
1272:0103 9C                    PUSHF
1272:0104 60                    DB      60
1272:0105 1E                    PUSH    DS
1272:0106 06                    PUSH    ES
1272:0107 0E                    PUSH    CS
1272:0108 1F                    POP     DS
1272:0109 BB0410            MOV     BX,1004
1272:010C C647FE85          MOV     BYTE PTR [BX-02],85
1272:0110 C647FE85      MOV     BYTE PTR [BX-02],85
1272:0114 BE0018        MOV     SI,1800
1272:0117 B1FF              MOV     CL,FF
1272:0119 E80E00        CALL    012A
1272:011C B90020        MOV     CX,2000
1272:011F E80800        CALL    012A
1272:0122 FC            CLD
1272:0123 8EC1          MOV     ES,CX
1272:0125 33FF          XOR     DI,DI
1272:0127 E9D607        JMP     0900
1272:012A C6071B        MOV     BYTE PTR [BX],1B
1272:012D FF47FC        INC     WORD PTR [BX-04]
1272:0130 884F09        MOV     [BX+09],CL
1272:0133 880C          MOV     [SI],CL
1272:0135 FF47FC        INC     WORD PTR [BX-04]
1272:0138 F60780        TEST    BYTE PTR [BX],80
1272:013B 74FB          JZ      0138
1272:013D 8517          TEST    DX,[BX]
1272:013F C3            RET


1272:0900 32E4          XOR     AH,AH
1272:0902 F6C10F        TEST    CL,0F
1272:0905 751F          JNZ     0926
1272:0907 C6071D        MOV     BYTE PTR [BX],1D
1272:090A FF47FC        INC     WORD PTR [BX-04]
1272:090D 8BD7          MOV     DX,DI
1272:090F 885709        MOV     [BX+09],DL
1272:0912 8814          MOV     [SI],DL
1272:0914 887709        MOV     [BX+09],DH
1272:0917 8834          MOV     [SI],DH
1272:0919 33D2          XOR     DX,DX
1272:091B 885709        MOV     [BX+09],DL
1272:091E 8814          MOV     [SI],DL
1272:0920 C60719        MOV     BYTE PTR [BX],19
1272:0923 E80FF8        CALL    0135
1272:0926 844709        TEST    AL,[BX+09]
1272:0929 AC            LODSB
1272:092A 02E0          ADD     AH,AL
1272:092C AA            STOSB
1272:092D 4E            DEC     SI
1272:092E E2D2          LOOP    0902
1272:0930 80FC55        CMP     AH,55
1272:0933 7505          JNZ     093A
1272:0935 9A00000020    CALL    2000:0000
1272:093A 07            POP     ES
1272:093B 1F            POP     DS
1272:093C 61            DB      61
1272:093D 9D            POPF
1272:093E CB            RETF
1272:093F 5C            POP     SP

it load SPL (offset 0x400h sizeof 8k in doc121.exb) to 2000:0 and jmp there
to execute.
 then the SPL load other TTFS etc.
i can fill the SPL with my bootloader like grub.but i don't know where can
the kernel put.
how can i READ/WRITE doc2000 with a absoluteness address.

in linux environment i insmod mtd,nftl,and doc2000.
i can mkfs and mount it.but can't format it with nftl-format.
error messages is "ioctl(MEMGETINFO): Invalid argument"

The error be appeared too when  use doc_loadbios to write doc firmware.
why?







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Re: about doc2000 bootstrap without M-system's firmware

[David Woodhouse]

jyllyj@263.net said:
> it load SPL (offset 0x400h sizeof 8k in doc121.exb) to 2000:0 and jmp
> there to execute.
>  then the SPL load other TTFS etc. i can fill the SPL with my
> bootloader like grub.

My copy of grub is 33K - does it fit?

> but i don't know where can the kernel put. how
> can i READ/WRITE doc2000 with a absoluteness address. 

If you can get grub loading from the SPL, that's excellent. 

To get grub to allow you to boot a kernel from the DiskOnChip, you have to 
build the DiskOnChip support into grub's disk drivers. For this you have to 
replace the rawread() routine in shared_src/disk_io.c

The code in my doc2000.c and nftl.c ought to be enough to help you add this 
support. 


--
dwmw2




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