On 3/23/07, Wolfgang Denk wd@denx.de wrote:
In message 27d85ee10703220240i7f783984u6dcf6ff0da79a25f@mail.gmail.com you wrote:
When the functions "eeprom_read" and "eeprom_write" works for the SPI flash, the data length is limited to I2C_RXTX_LEN. See the following piece of code.
Umm... what do you mean with SPI flash?
The "eeprom*" commands are intended to access EEPROM devices; for me, EEPROM and flash memory are two different things. Maybe you can explain what you are talking about?
The part number of the chip is M25P64, which is a serial flash memory with SPI bus interface, since this flash and parallel NOR flash can work at the same time on our board, I think using "eeprom*" commands is correct for this kind of flash.
The following patch fixes this issue.
Please also explain what "the issue" is? What exactly is not working as intended?
If I want to write kernel image to the SPI flash, I do the following steppes: 1) tftpboot 0x1000000 uImage
2) eeprom write 0x1000000 0x100000 $(filesize)
Here I encountered the problem, the length passed to the spi_write() function is the kernel image size, far bigger than the macro I2C_RXTX_LEN. So eeprom write doesn't work properly as intended. The patch can fix it. IMHO, when we do the spi operation, we shouldn't limit the data length to a I2C macro.
Best Regards, -Aubrey