On 07.09.2012 20:41, Carolyn Smith wrote:
Hello,
I have a custom i.MX6 board that is configured to boot from 16-bit parallel
NOR flash using non-multiplexed I/O with the data on the upper half of the
data bus. I.e. chip select 0 of the EIM bus should be configured so that
MUM = 0 and DSZ = 010b.
However, the board is coming out of reset (using a BDI3000) with MUM = 1
and DSZ = 001b so multiplexed I/O with the data on the lower half of the
data bus. According to the EIM multiplexing table, this isn't even a valid
configuration.
Check the BOOT_MODE and BOOT_CFG of your board. A valid boot
configuration to boot from parallel NOR on your board should look like this:
SRC_SBMR1: 0x02044000
Further, if I change the EIM_CS0GCR1 register (using the BDI) to force MUM
= 0 and DSZ = 010b, then read from the flash, I can see the correct data on
the bus using a logic analyzer but the BDI always returns 0.
Check the pin multiplex and EIM configuration. An example can be found in
u-boot-2009.08/board/freescale/mx6q_sabreauto/mx6q_sabreauto.c
in Freescale's latest U-Boot ER release for i.MX6.
Best regards
Dirk
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