DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 60)

Jan Yin Chan Electronics Co.,LTD. 386SX Single Chip PC

M6117D : System on a chip

DM&P

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC Page 59

8F-1,No.22,Wuchyuan 2RD.,Hsin Chuang city Taipei Hsien, Taiwan, R.O.C. Tel: 886-(02) 2298-0770 Fax: (02) 2299-1883

Auto_DRAM_sizing :

call DRAM_Type_Detection ; Detect and set the EDO DRAM

; enable 8042 address line 20 here

.386p

mov eax, cr0 ; Set PE

or al, 01h ; Enter protected mode

mov cr0, eax

cli

lgdt cs: big_gdt_descriptor

jmp short enter_protected_mode

enter_protected_mode:

mov ax, 0008h

mov ds, ax

mov ax, 01010h ; Set mode 30 for DRAM sizing

call Read_From_Chip

and al, 00000111b

or al, 11101000b

xchg ah, al

call Write_To_Chip

xor dx, dx ; store DRAM mode

mov esi, 3000h ; A13, A12 enable - bank 3

sizing_bank_23:

mov edi, 800h ; A11

and dl, 0f0h

or dl, 5 ; 5 --- 4M

mov ds: word ptr[esi+edi], 0aa99h

mov ds: word ptr[esi], 099aah ; dummy write

cmp ds: word ptr[esi+edi], 0aa99h

jz sizing_bank_23_end ; 4M, go to test next bank

mov edi, 400h ; A10

and dl, 0f0h

or dl, 3 ; 3 --- 1M

mov ds: word ptr[esi+edi], 0bb88h

mov ds: word ptr[esi], 088bbh ; dummy write

cmp ds: word ptr[esi+edi], 0bb88h

jz sizing_bank_23_end ; 1M, go to test next bank

mov edi, 2h ; A1

and dl, 0f0h

or dl, 1 ; 1 --- 256K

mov ds: word ptr[esi+edi], 0cc77h

mov ds: word ptr[esi], 077cch ; dummy write

cmp ds: word ptr[esi+edi], 0cc77h

jz sizing_bank_23_end ; 256K, go to test next bank

and dl, 0f0h ; none in this bank

sizing_bank_23_end:

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 111 112

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