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The Manuf bytes at 0x840-843 specify the SDRAM config.
Values are :

• FF FF FF FF for 32Mib on ClickPad/TouchPad
• 12 80 01 FC for 64MiB on CX
• 11 80 01 FE for 32MiB on CM and CX EVT (Color prototype)

New Boot1 4.0.1 has a Manuf reflashing boot combo ( ), which enables you booting the emulator with values it would have refused to start with.

Here's the logic :

• if value at 0x840-843 is FF FF FF FF, then SDRAM is 32MiB
• else :
  
  • take the 0x840 byte value
  • only keep the 6 lowest bits
  • SDRAM size in MiB is 4*2^((value/8)+(value%8))

With 0x12, 0x12=18, 18/8=2, 18%8=2, 4*2^(2+2)=4*2^4=4*16=64MiB
With 0x11, 0x11=17, 17/8=2, 17%8=1, 4*2^(2+1)=4*2^3=4*8=32MiB

For example, by flashing 0x3F you get the maximum :
0x3F=63, 63/8=7, 63%8=7, 4*2^(7+7)=4*2^14=4*16384=65536MiB=64GiB

And it works... in the emulator :

Code: Tout sélectionner

Boot Loader Stage 1 (4.0.1.43)
Build: 2015/7/20, 14:47:25
Copyright (c) 2006-2015 Texas Instruments Incorporated
Using production keys

Last boot progress: 1065

Available system memory: 28072
Checking for NAND: NAND Flash ID: Generic 1 GBit (0xA1)
SDRAM size: 65536 MB
Wakeup Event: ON.
SDRAM memory test:   Pass
Clearing SDRAM...Done.
Clocks:  CPU = 132MHz   AHB = 66MHz   APB = 33MHz
Clearing SDRAM...Done.
Boot option: Normal

Hackspire doc updated :
https://hackspire.org/index.php/NAND_Me ... NAND_Flash