Flash Burst Mode, where goes init to?
Hi!
With u-boot command interface I finally got the burst mode of my intel 28F128K3 device running. Initializing is in three steps:
Tell Flash it should "bursting", write 7F84 into RCR register:
mm.w 0x00007F84 <- 0x60
Then Chipselect 0 is informed:
mm 0x220000 <- 0x00510800
Finally send ACK Command to Flash in burst mode:
mm.w 0x00007F84 <- 0x03
Thats it. Or, in assembler it _should_ look like:
/* initialize burst mode */
ldr r0, =FLASH_ADDRESS
ldr r1, =FLASH_RCR_CMD
str r1, [r0] ldr r0, =CS0U
ldr r1, =CFG_CS0U_B_VAL
str r1, [r0] ldr r0, =FLASH_ADDRESS
ldr r1, =FLASH_ACK_CMD
str r1, [r0]/* end initializing burst mode */
To experiment with different timings and word burst sizes I would like to implement the code into the u-boot code. But where do I should put it? I use Motorola ARM9 i.MX CPU on scb9328 board.
If I understood right, 1st memsetup.S is executed, after that the relocation starts. My reading of the code is vice versa sequence, I am confused now...
Konsti
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Quoted 3 lines · In message <20050128105542.GC8252@synertronixx3> you wrote:
With u-boot command interface I finally got the burst mode of my intel 28F128K3 device running. Initializing is in three steps:
...
Quoted 3 lines
To experiment with different timings and word burst sizes I would like to implement the code into the u-boot code. But where do I should put it? I use Motorola ARM9 i.MX CPU on scb9328 board.
It should go in the flash init routine which initializes the flash devices.
Best regards,
Wolfgang Denk
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Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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