imx51 u-boot

[wysockilukasz]

Hello,

I have custom board with imx51, and u-boot 2009.

System starts from sd card but I would like to port it to parallel nor flash (Micron m29ew)  connected do CS0.

I modified config.h,

change: CONFIG_FLASH_HEADER_OFFSET 0x1000 /* 0x400 */

add:

#define CONFIG_SYS_FLASH_BASE	0Xb0000000
#define CONFIG_SYS_MAX_FLASH_BANKS	1
#define CONFIG_SYS_MAX_FLASH_SECT	(1)

#define CONFIG_SYS_MONITOR_BASE    0xb0000000

#define CONFIG_SYS_MONITOR_LEN

(384 * 1024)

#define CONFIG_ENV_ADDR	(CONFIG_SYS_FLASH_BASE + 384 * 1024)
#define    CONFIG_ENV_IS_IN_FLASH	1

#define CONFIG_ENV_SECT_SIZE    1023

#define CONFIG_ENV_OFFSET    ( CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN )

/*-----------------------------------------------------------------------

* CFI FLASH driver setup

*/

#define CONFIG_SYS_FLASH_CFI

1

#define CONFIG_FLASH_CFI_DRIVER    1 

#define CONFIG_SYS_FLASH_USE_BUFFER_WRITE 1 

#define CONFIG_SYS_FLASH_ERASE_TOUT	(100*CONFIG_SYS_HZ)
#define CONFIG_SYS_FLASH_WRITE_TOUT	(100*CONFIG_SYS_HZ)

and set up all efuse but u-boot doesn't even start.

Can you help me?

Lukasz

[fabio_estevam]

I would suggest you to try a more recent U-boot, like 2013.04.

If you face issues with this version, then please post it to the u-boot list.

[weidong_sun]

Hello,wysockilukasz,

     The modification you did is not enough, Paralell nor flash will use WEIM interface of i.mx51, normally it has 25bit or 26bit address line and 16bit data lines, for example , probably you will use EIM_DA0~EIM_DA15 and EIM_A16~EIM_A25 to be address lines, and EIM_D16~EIM_D31 is used to be data lines; EIM_OE is reading signal, EIM_RW is writing signal, EIM_CS0 is used as chipselect,  So you will configure these pins in u-boot/board/freescale/mx51_bbg/mx51_bbg.c :

(1)IOMUX all pins you will use.

(2)Setting IOMUX mode( such as 16bit non-mux mode etc)

(3)Setting work mode (maybe it works as asysncronous mode)

(4)Setting total capacities on EIM_CS0 and disable other EIM_CSx.

For mode detail, please refer to weim interface in mcimx51RM.pdf

   Then on hardware, you should set boot_mode0 & boot_mode1 pin to be internal mode. and set corresponding EIM PINs to boot from Parallel NOR Flash connected to WEIM interface.

Regards,

Weidong

[weidong_sun]

,Hello,wysockilukasz,

         Do you understand above steps ?

Weidong

[wysockilukasz]

Hello and thanks for your reply!

I did all this of this changes, but I think that the problem is somewhere else.

It seems that lowlevel_init doesn't start at all.

In this part after Uart initialization (this code works when u-boot starts form sd card) -  before even u-boot starts I puts so small logs and now I can't see them.

I will be appreciate for your help!

Regards
Lukasz

[weidong_sun]

Hi,wysockilukasz

      Could you share the following information ?

(1)Schematic of your board

(2)tell me the bsp version you are using

weidong

[wysockilukasz]

Hi!
Ad1. I can't show you my schematic but:

- address lines: EIM_DA0-EIM_DA15 + EIM_A16-EIM_A26
- data lines: EIM_D16 - EIM_D31
- chip select:  EIM_CS0

- Output Enable:  EIM_OE

- Write eneble: EIM_RW

Nor flash: PC28F00AM29EWL

I'm booting from internal flash witch fuse overridden by the GPIO.

BT_MEM_CTL - 00 WEIM

BT_MEM_TYPE - 00 NOR

BT_WITDTH - 0 16 bits

BT_WEIM_MUXED - 00 -Not muxed, not multiplexed with NAND,

                                        16-bit data (high half) NOR interface.

Ad.2. I'm using QNX Neutrino 6.4.1 BSP

Regards
Lukasz

[weidong_sun]

Hello,wysockilukasz,

      According to your description, your configuration / settings on hardware are all correct. But QNX bsp is supported by QNX Company, So probably you can try to contact with QNX supporting engineer.

weidong