Vybrid nand flash boot issue

jeremyesquirol — Fri, 22 Aug 2014 07:12:39 GMT

Hi,

I'm trying to load u-boot, kernel and RFS from sd card to nand flash on PHYcore-Vybrid (PCM052).

I've saved rootfs.jffs2 and uImage files into sd card on fat part. I boot on sd card and copy u-boot, kernel and RFS from u-boot. I've generated the rootfs.jffs2 using the timesys factory (enabling jffs2 RFS on menuconfig).

The u-boot, and kernel seems correctly loaded into flash, but not theRFS.

I used the following commands:

u-boot :

nand erase 0x40000 0x40000; mw.b 0x80400000 0xff 0x40000; fatload mmc 0:2 0x80400000 u-boot.nand; nb_update 0x80400000 0x40000 0x40000

kernel using env variable :

update_kernel_from_sd=mw.b $(loadaddr) 0xff 0x400000; mmc rescan; fatload mmc 0:2 ${loadaddr} ${bootfile}; nand erase 0xA0000 0x400000; nand write.i ${loadaddr} 0xA0000 0x400000
run update_kernel_from_sd

RFS using env variable :

update_rootfs_from_sd=mw.b ${loadaddr} 0xff 0x8F20000;mmc rescan; fatload mmc 0:2 ${loadaddr} ${filesys}; nand erase 0x4A0000 0x8F20000; nand write.i ${loadaddr} 0x4A0000 0x8F20000

I have no error after using these commands. I can boot from nand, when enterring on the u-boot, I set the 'bootcmd' to boot on NAND. Here are my env variables for nand boot :

bootargs_base=setenv bootargs rw mem=256M console=ttymxc1,115200n8 init=/sbin/init
bootargs_mtd=setenv bootargs ${bootargs} ${mtdparts}
bootargs_nand=setenv bootargs ${bootargs} root=/dev/mtdblock3 rootfstype=jffs2
bootcmd=run bootcmd_nand
bootcmd_nand=run bootargs_base bootargs_nand bootargs_mtd; nand read ${loadaddr} 0x000A0000 0x400000; bootm ${loadaddr}
mtdids=nand0=NAND
mtdparts=mtdparts=NAND:256k(spare),256k(bootloader),128k(env),4m(kernel),-(rootfs)

When I boot with these parameters, kernel start but I've an ECC error (I don't know the meaning of this error):

uncorrectable error :
mtd_read(0x100 bytes from 0x0) returned ECC error
...

(It seems i'm having some troubles with spam filter so I can't set the entire error message. Complete boot sequence is in attachments.)

Could you help me please? Any Idea?

Original Attachment has been moved to: boot_sequence_nand_error.txt.zip

Re: Vybrid nand flash boot issue

karina_valencia — Mon, 25 Aug 2014 17:10:45 GMT

timesyssupport can you attend this case?

Re: Vybrid nand flash boot issue

timesyssupport — Mon, 25 Aug 2014 17:13:56 GMT

Hello Jérémy,

Can you please try flashing the RFS using the method described here; this is applicable to the pcm052 hardware as well.

https://linuxlink.timesys.com/docs/projects/engineering/wiki/NAND_Boot_for_Vybrid_Tower#Writing-RFS-to-NAND-Flash

Thanks,

Timesys Support

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