Does anybody tell me how can I delete completly an atmel dataflash wit U-Boot. I try this first: 1. I unprotect the areas of the dataflash. 2 then i want to erase but i become follow messages: start and/or end adres not on sector boundary. I look at the atmel site datasheet of th dataflash, but i can't find there anything else sector boundaries. Thanks for your answers.

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There are several unknowns which you will need to provide to answer your question:

- Which ATMEL part number? This will tell you what sector size(s) the chip has.

- Is the chip is 8-bit or 16-bit mode? Different chips support one or both modes.

- What is the flash configuration on the board? x1, x2 or x4, creating an

8-bit, 16-bit or 32-bit interface to the CPU?

When you have the answers to these questions, you can then calculate the sector boundaries for your implementation.


Reply to
Chuck Gales

Other questions and issues aside, I'll pick nits here by saying that DataFlash uses SPI, a serial interface. So that would be (for all intents and purposes) a 1-bit interface to the CPU.

That said, the source code for U-Boot is readily available and could be reviewed to determine how it deals with sector boundaries for DataFlash devices. Trying to get answers here is a reasonable approach, but one does have access to the code itself as an alternate source of information.

-- Dan Henry

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Dan Henry

And there is the Atmel's at91.com site with many boards using U-Boot and DataFlash.

BTW, what does U-Boot's 'flinfo' command report about the DataFlash organization?

-- Dan Henry

Reply to
Dan Henry


  1. >>>> then i want to erase but i become follow messages: start and/or en





I become this info: DataFlash:AT45DB642 Nb pages: 8192 Page Size: 1056 Size= 8650752 bytes Logical address: 0xC0000000 Area 0: C0000000 to C0007FFF (RO) Area 1: C0008000 to C001FFFF (RO) Area 2: C0020000 to C0027FFF Area 3: C0028000 to C083FFFF

Bank # 1: Atmel: AT49BV6416 (64Mbit) Size: 8 MB in 135 Sectors Sector Start Addresses: 10000000 (RO) 10002000 (RO) 10004000 (RO) 10006000 10008000 1000A000 1000C000 1000E000 (RO) 10010000 (RO) 10020000 10030000 10040000 10050000 10060000 10070000 10080000 10090000 100A0000 100B0000 100C0000 100D0000 100E0000 100F0000 10100000 10110000 10120000 10130000 10140000 10150000 10160000 10170000 10180000 10190000 101A0000 101B0000 101C0000 101D0000 101E0000 101F0000 10200000 10210000 10220000 10230000 10240000 10250000 10260000 10270000 10280000 10290000 102A0000 102B0000 102C0000 102D0000 102E0000 102F0000 10300000 10310000 10320000 10330000 10340000 10350000 10360000 10370000 10380000 10390000 103A0000 103B0000 103C0000 103D0000 103E0000 103F0000 10400000 10410000 10420000 10430000 10440000 10450000 10460000 10470000 10480000 10490000 104A0000 104B0000 104C0000 104D0000 104E0000 104F0000 10500000 10510000 10520000 10530000 10540000 10550000 10560000 10570000 10580000 10590000 105A0000 105B0000 105C0000 105D0000 105E0000 105F0000 10600000 10610000 10620000 10630000 10640000 10650000 10660000 10670000 10680000 10690000 106A0000 106B0000 106C0000 106D0000 106E0000 106F0000 10700000 10710000 10720000 10730000 10740000 10750000 10760000 10770000 10780000 10790000 107A0000 107B0000 107C0000 107D0000 107E0000 107F0000

I have a 64 Mbit dataflash AT45DCB008 the At91RM9200-EK board. I need empty dataflash to write Atmel bootloader which boots about a SDcard.

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No you don't. Remove the Dataflashcard. Set the jumper to "INT" position to force the CPU to run from the internal bootROM. Powerup the system. Since there is no dataflash connected, the CPU will not find a bootable image and will try to download code over USB or UART. Insert the dataflash card.

Download the Atmel dataflash loader (into internal SRAM) using Hyperterminal/Xmodem. The CPU will jump to this once completed.

You will be presented a menu with three alternatives.

1 Program dataflash 2 List Dataflash 3 Jump to U-boot

Select (1) and send the dataflash loader again using Hyperterminal/Xmodem. This time the loader will be programmed into the first sector of the dataflash.

Reset the system and you should be running from dataflash.

A. P. Richelieu
Reply to
A.P. Richelieu

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