DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 62)

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 61

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

is_1or2M:

mov edi, 1000000 ; A24

mov ds: word ptr[esi+edi], 034cdh

mov ds: word ptr[esi], 0ed34h ; dummy write

cmp ds: word ptr[esi+edi], 034cdh

jnz short sizing_bank_01_end ; 1M

and dl, 0f0h

or dl, 4 ; 2M

jmp short sizing_bank_01_end

is_2or5K:

mov edi, 100000 ; A20

mov ds: word ptr[esi+edi], 056efh

mov ds: word ptr[esi], 0ef56h ; dummy write

cmp ds: word ptr[esi+edi], 056efh

jnz short sizing_bank_01_end ; 256K

and dl, 0f0h

or dl, 2 ; 512K

sizing_bank_01_end:

cmp esi, 0

jz short sizing_memory_end

mov esi, 0 ; bank 0

jmp sizing_bank_01

sizing_memory_end:

mov ax, 010h ; reset descriptor

mov ds, ax

mov eax, cr0 ; reset PE

and al, 0feh

mov cr0, eax

jmp short enter_real_mode

enter_real_mode:

.286p

; disable 8042 address line 20 here

mov si, offset cgroup: mem_config_table

mov cx, 32

check_mode :

mov ax, cs: word ptr[si]

cmp dx, ax

jz short check_mode_end

add si, 6

loop check_mode

; Display memory error here

;

; if dx = 0001, set

mode 5 for 512K DRAM

;

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