[U-Boot-Users] flash driver in u-boot
I'm a little confused by flash driver selection in u-boot. My flash device is intel JS28F128J3, I assume it's not CFI flash so I want to use strataflash.c. I added such file under my board directory, add it into Makefile, and undef CFG_FLASH_CFI_DRIVER, but I got link error. If define this macro, the compilation is ok and my flash works. My question is, if we define this macro, which flash driver being used? cfi_flash.c or my strataflash.c?
I'll appreciate if someone can shed some lights.
- Reeve
On Mon, 2006-10-16 at 22:53 +0000, Reeve Yang wrote:
I'm a little confused by flash driver selection in u-boot. My flash device is intel JS28F128J3, I assume it's not CFI flash so I want to use strataflash.c. I added such file under my board directory, add it into Makefile, and undef CFG_FLASH_CFI_DRIVER, but I got link error. If define this macro, the compilation is ok and my flash works. My question is, if we define this macro, which flash driver being used? cfi_flash.c or my strataflash.c?
A little Googling will nix your assumption. You should be able to use CFI.
regards, Ben
Reeve Yang wrote:
I'm a little confused by flash driver selection in u-boot. My flash device is intel JS28F128J3, I assume it's not CFI flash so I want to use
Intel 28F128J3 is a CFI compliant flash chip.
strataflash.c. I added such file under my board directory, add it into Makefile, and undef CFG_FLASH_CFI_DRIVER, but I got link error. If
strataflash.c driver is a pre-cursor to common cfi_flash.c. Most boards are reworked to use the cfi_flash.c. To use strataflash.c you also had to define CFG_FLASH_CFI_DRIVER (as far as my memory serves). There is no reason to use a custom flash driver nowadays unless your flash is interfaced to the processor bus in a very unusual way (like data bus scrambled -- hardware design bugs)
define this macro, the compilation is ok and my flash works. My question is, if we define this macro, which flash driver being used? cfi_flash.c or my strataflash.c?
Use cfi_flash.c
Tolunay
But cfi_flash.c doesn't work for me. It always complains "flash is busy" when I try to write something. However strata_flash.c works. why is that? By the way, is there anyway to read flash contents in u-boot? md?
On 10/16/06, Tolunay Orkun listmember@orkun.us wrote:
Reeve Yang wrote:
I'm a little confused by flash driver selection in u-boot. My flash device is intel JS28F128J3, I assume it's not CFI flash so I want to use
Intel 28F128J3 is a CFI compliant flash chip.
strataflash.c. I added such file under my board directory, add it into Makefile, and undef CFG_FLASH_CFI_DRIVER, but I got link error. If
strataflash.c driver is a pre-cursor to common cfi_flash.c. Most boards are reworked to use the cfi_flash.c. To use strataflash.c you also had to define CFG_FLASH_CFI_DRIVER (as far as my memory serves). There is no reason to use a custom flash driver nowadays unless your flash is interfaced to the processor bus in a very unusual way (like data bus scrambled -- hardware design bugs)
define this macro, the compilation is ok and my flash works. My question is, if we define this macro, which flash driver being used? cfi_flash.c or my strataflash.c?
Use cfi_flash.c
Tolunay
Reeve Yang wrote:
But cfi_flash.c doesn't work for me. It always complains "flash is busy" when I try to write something. However strata_flash.c works. why is that? By the way, is there anyway to read flash contents in u-boot? md?
Define success! Did you actually verify that strataflash.c worked correctly. It might be silently ignoring the issues and giving you false impression that it was successful. Did you actually check the flash contents after write? Since you are asking about if md could be used for reading the flash it tells me you do not know if strataflash was actually successful.
I have got no idea what code base you are using (top of git tree or some older version). What CPU architecture you have? How it is interfaced to your CPU? If flash mapped to the address space correctly. Is that memory space enabled for write access? Is the timing setup correctly (wait states, holds etc?). Which one of many strataflash.c you have used (some with different tweaks)?
Many things can go wrong that could prevent normal operation. If you had posted actual screen capture from CFI driver and the strataflash.c and perhaps someone could provide more hints. Ultimately, the code is there. You will need to do some code reading and debugging to find out why cfi_flash gives always busy. Or hire someone to do this for you.
All I can say is that cfi_flash.c works with this chip. Cogent csb272 uses 2 of these chips side by side using cfi_flash.c.
Tolunay
On 10/16/06, *Tolunay Orkun* <listmember@orkun.us mailto:listmember@orkun.us> wrote:
Reeve Yang wrote: > I'm a little confused by flash driver selection in u-boot. My flash > device is intel JS28F128J3, I assume it's not CFI flash so I want to use Intel 28F128J3 is a CFI compliant flash chip. > strataflash.c. I added such file under my board directory, add it into > Makefile, and undef CFG_FLASH_CFI_DRIVER, but I got link error. If strataflash.c driver is a pre-cursor to common cfi_flash.c. Most boards are reworked to use the cfi_flash.c. To use strataflash.c you also had to define CFG_FLASH_CFI_DRIVER (as far as my memory serves). There is no reason to use a custom flash driver nowadays unless your flash is interfaced to the processor bus in a very unusual way (like data bus scrambled -- hardware design bugs) > define this macro, the compilation is ok and my flash works. My question > is, if we define this macro, which flash driver being used? cfi_flash.c > or my strataflash.c? Use cfi_flash.c Tolunay
Do you have a timeout and using timer to test it?
Reeve Yang wrote:
But cfi_flash.c doesn't work for me. It always complains "flash is busy" when I try to write something. However strata_flash.c works. why is that? By the way, is there anyway to read flash contents in u-boot? md?
On 10/16/06, *Tolunay Orkun* <listmember@orkun.us mailto:listmember@orkun.us> wrote:
Reeve Yang wrote: > I'm a little confused by flash driver selection in u-boot. My flash > device is intel JS28F128J3, I assume it's not CFI flash so I want to use Intel 28F128J3 is a CFI compliant flash chip. > strataflash.c. I added such file under my board directory, add it into > Makefile, and undef CFG_FLASH_CFI_DRIVER, but I got link error. If strataflash.c driver is a pre-cursor to common cfi_flash.c. Most boards are reworked to use the cfi_flash.c. To use strataflash.c you also had to define CFG_FLASH_CFI_DRIVER (as far as my memory serves). There is no reason to use a custom flash driver nowadays unless your flash is interfaced to the processor bus in a very unusual way (like data bus scrambled -- hardware design bugs) > define this macro, the compilation is ok and my flash works. My question > is, if we define this macro, which flash driver being used? cfi_flash.c > or my strataflash.c? Use cfi_flash.c Tolunay
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participants (4)
-
Ben Warren -
Michael Trimarchi -
Reeve Yang -
Tolunay Orkun