Re: [U-Boot] How to start U-Boot for i.MX31 NAND out of RedBoot (out of RAM)
Hello again,
Magnus Lilja lilja.magnus@gmail.com 14.07.09 13.08 Uhr >>>
Hi
Another strange thing is the nand driver. I build my u-boot with: #define CONFIG_MX31_NAND 1 #define CONFIG_CMD_NAND #define CONFIG_SYS_NO_FLASH 1 #define CONFIG_ENV_IS_IN_NAND 1 #define CONFIG_SYS_NAND_BASE CS0_BASE #define CONFIG_SYS_MAX_NAND_DEVICE 1 #define CONFIG_SYS_NAND_MAX_CHIPS 1
If I then try to get "flinfo" information u-boot jumps to the next command line and prints nothing. If I try "nand info" I get information about nand device 0. Another strange thing is that I can't read from nand flash but I can write.
Do you have any suggestions?
The only i.MX31 NAND driver I've used in U-boot is the one I submitted to the list last year but it was rejected. Other people have sent updated drivers (I think there was a i.MX27 driver posted not long ago), but I haven't tried these. Even so, the CONFIG_SYS_NAND_BASE looks incorrect but I don't know if that's the only problem.
CONFIG_SYS_NAND_BASE CS0_BASE should be correct because the Flash is located at 0xA0000000 which should be CS0_BASE. Why do you think it is wrong?
I used the patch from you out of this posting: [U-Boot-Users] [PATCH RFC 3/5] i.MX31: Add i.MX31 NAND Flash Controller driver. http://lists.denx.de/pipermail/u-boot/2008-August/038239.html
They should work, or not? Do they require something else?
Thanks a lot for your help.
Best Regards Ulrich Gerster
Hi
2009/7/14 Ulrich Gerster gersteru@dhbw-loerrach.de:
Hello again,
Magnus Lilja lilja.magnus@gmail.com 14.07.09 13.08 Uhr >>>
Hi
Another strange thing is the nand driver. I build my u-boot with: #define CONFIG_MX31_NAND 1 #define CONFIG_CMD_NAND #define CONFIG_SYS_NO_FLASH 1 #define CONFIG_ENV_IS_IN_NAND 1 #define CONFIG_SYS_NAND_BASE CS0_BASE #define CONFIG_SYS_MAX_NAND_DEVICE 1 #define CONFIG_SYS_NAND_MAX_CHIPS 1
If I then try to get "flinfo" information u-boot jumps to the next command line and prints nothing. If I try "nand info" I get information about nand device 0. Another strange thing is that I can't read from nand flash but I can write.
Do you have any suggestions?
The only i.MX31 NAND driver I've used in U-boot is the one I submitted to the list last year but it was rejected. Other people have sent updated drivers (I think there was a i.MX27 driver posted not long ago), but I haven't tried these. Even so, the CONFIG_SYS_NAND_BASE looks incorrect but I don't know if that's the only problem.
CONFIG_SYS_NAND_BASE CS0_BASE should be correct because the Flash is located at 0xA0000000 which should be CS0_BASE. Why do you think it is wrong?
Because the NAND flash is not connected to any of the standard memory mapped chip selects of the i.MX31. The i.MX31 has a dedicated NAND interface. But I don't think CONFIG_SYS_NAND_BASE matters for the i.MX31, the rest of U-boot needs it to be defined to something.
I used the patch from you out of this posting: [U-Boot-Users] [PATCH RFC 3/5] i.MX31: Add i.MX31 NAND Flash Controller driver. http://lists.denx.de/pipermail/u-boot/2008-August/038239.html
They should work, or not? Do they require something else?
I haven't tried that driver on a recent U-boot so I don't know if (or how) it will work when applied to a recent U-Boot.
Did you define the following two as well (they might have been renamed since last year). #define CFG_ENV_OFFSET 0x40000 /* CFG_ENV_SIZE has to be a multiple of the NAND block size */ #define CFG_ENV_SIZE (128 * 1024)
If CFG_ENV_OFFSET (or perhaps it's called CONFIG_ENV_OFFSET nowadays) is zero, then 'saveenv' will overwrite your existing redboot.
/Magnus
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Magnus Lilja -
Ulrich Gerster