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| 06:57.32 | |val| | Hello all, I have a problem to write into the flash memory via JTAG. I can dump flash memory, I can write something in it (I see it), but when I restart the embedded device, the flash memory become like it was before I write something. Someone can help me to understand why ? (the MMU is disabled, AMR926ej, no DCache set) |
| 07:03.04 | keesj | and the flash detect works? |
| 07:10.09 | |val| | it's via the JTAG and via the CPU so it's detected like memory |
| 07:10.59 | |val| | but it's possible to write to flash memory with the cpu ? |
| 07:36.49 | |val| | I have read some informations about flashing flash devices. When you use the JTAG to flash this device, you use the CPU or you bypass it ? |
| 07:49.07 | keesj | |val|: the thing is that is usualy is memory-mapped so you need to know the address in memory where it is mapped |
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| 07:59.56 | |val| | keesj: I searched specifications about the arm926ej and I found that the reset is at 0x0 or 0xffff0000. I have a copy of the bootloader in my pc and it's exactly the same as the code in 0xffff0000. So I conclude that 0xffff0000 contains the bootloader, and it's obligatory the flash (not a RAM memory), so I deviced to modify some bytes of the bootloader and when I restart nothing changes. |
| 08:00.23 | |val| | What did I miss ? |
| 08:02.09 | |val| | I don't have memory map specs of my embedded device |
| 09:32.31 | keesj | Don't know sorry |
| 09:33.29 | roxfan2 | usually you need to enable flash writing in some special way |
| 09:33.45 | roxfan2 | it doesn't work as writable memory |
| 09:33.56 | roxfan2 | what is your device? |
| 09:37.18 | |val| | roxfan2: the memory chip is a KBE00F005M |
| 09:37.32 | |val| | it contains SDRAM and NAND flash |
| 09:38.08 | roxfan | if it's an external flash you usually need to use CFI |
| 09:38.51 | roxfan | if openocd supports your specific cpu, try flash writing commands |
| 09:38.52 | |val| | there is a pin for write protection into flash memory (active up), I force it to down |
| 09:39.07 | roxfan | (not memory writing) |
| 09:40.17 | |val| | roxfan: if I understand well (french), you tell me it's not possible to write into flash memory directly with cpu, but we need specific command to write in ti ? |
| 09:40.34 | roxfan | yes, usually that's the case |
| 09:40.55 | roxfan | http://openocd.berlios.de/doc/Flash-Configuration.html#Flash-Configuration |
| 09:41.13 | |val| | roxfan: thanks a lot, I have to see to openocd way ? |
| 09:41.22 | |val| | any other documentation ? |
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| 19:35.27 | pingus_ | hello there |
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| 23:02.14 | flyback | http://www.hardocp.com/image.html?image=MTIzNzQ3Njc2N2ZQWU1ISXNZVkZfMV8xX2wuZ2lm <--- this is a joke right? |
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| 23:56.43 | flyback | bbl |