Hi,
My target is boot from NANDFLASH, the chip is MT29F8G08ABACAH4-IT:C. So, I have to program the fuses in BOOT_CFG1 and BOOT_CFG2, as table 8-10 of the reference manual show. I would like to be sure, before programming fuses because I only have a few prototypes of my custon imx6solo board.
I paste an image with the values I think are correct squared in red color.
- BOOT_CFG1[7]: Obviously this bit need to be 1 to indicate boot NAND.
- BOOT_CFG1[5]: I don’t understand this bit, ¿What is the value that I need to put in?
- BOOT_CFG1[4]: I understood this fuse is for config IO pad settings, so for now I am going to leave as 0.
- BOOT_CFG1[3:2]: I only have one chip in mi design, so this fuse will be 00.
- BOOT_CFG1[1:0]: Row Address Bytes. I don’t understand this bit, but the “kobs-ng” command in linux say that “row_address_size = 3”, if this info is related whit this fuse I think the value need to be 00.
- BOOT_CFG2[7:5]: I don’t know what is my optimal value, and I don’t understand these fuses. ¿Are related with BOOT_CFG1[5]?
- BOOT_CFG2[4:3]: For now I leave these fuses as 00, But I think it could be 10 since “kobs-ng” repeat 4 times the FCB structure.
- BOOT_CFG[2:1]: These fuses need to be 01 since the nand flash datasheet says that chips has 64 pages per block.
- BOOT_CFG2[0]: I don’t understand this fuse, but for now I leave as 0.
Assuming RAW mode, 16 GPMICLK cycles, reset time 12ms, the values for BOOT_CFG1 and BOOT_CFG2 are:
BOOT_CFG1 | ||||||||
Bit position | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Value=0x80 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
BOOT_CFG2 | ||||||||
Bit position | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Value=0x02 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
Using uboot command to program fuses:
=>fuse prog 0 5 0x00000280
Questions:
- Is it necessary program some fuse in BOOT_CFG2 or BOOT_CFG3, or other fuse to boot form my nand?
- Is the fuse uboot command correct (fuse prog 0 5 0x00000280)?
- Please, could you give me the values for fuses that I don’t understand? And a brief explication:
- BOOT_CFG1[5]
- BOOT_CFG2[7:5]
- BOOT_CFG1[1:0]
- BOOT_CFG2[0]
Hi Igor,
I have tried to program the fuses with the command:
fuse prog 0 5 0x00000280
But it does not boot from nand
Also the nand has been programmed with "kobs-ng -x -v u-boot.imx"
It could be the row address cyles. Now I have value 3 and as I see in table 2 of the datasheet it should be 2. is it correct, I'm not sure I understand the table2.
BR
