[U-Boot] about ## Unknown FLASH on Bank 0

[Peter Pan]

Dear Wolfgang Denk:

Our hardware should be fine. We run VxWorks on it before and it works fine.
The hardware running VxWorks is already
a mature product of our company. We recently want to run linux on it because
of the high price of VxWorks.

I do a little experiments on the U-Boot-2009-08, any I successfully make the
"Unknown Flash on Bank 0" appear without any
code modification on common files. I only add my board specification files
and my config file, change the Makefile to
support my board files to compile, then the "unknown flash on bank 0"
appears.

I use ELDK for cross compile, and the ELDK gcc version is :
ppc_6xx-gcc(GCC) 4.2.2

Which part of the code may cause this kind of problem? Maybe I can send your
that part of my codes.

2009/10/27 Wolfgang Denk <wd at denx.de>

> Dear Peter Pan,
>
> please keel the mailinmg list on Cc:
>
> In message <48abf2c20910261812g75d17990jd1793f0560bc882c at mail.gmail.com>
> you wrote:
> >
> > I also think the 1.2.0 is an ancient version, so I migrate my u-boot from
> > 1.2.0 to u-boot-2009-08 yestoday, the same "Unknown Flash Bank" problem
> > happened.
> > I changed a little in the common files, all of which I think should not
> lead
> > to this "Unknown Flash Bank" problem.
> > I use MPC8247, and all my changes are:
>
> Which exact board are you using?
>
> > 1. in /common/env_common.c, I add my environment variables to array
> > default_environment.
>
> Bad, very bad. You should never meddle with this file. You should add
> your custom settings to your board config file only.
>
> > 2. in /cpu/mpc8260/cpu_init.c, in function cpu_init_f, I common this line
> > "immr->im_clkrst.car_rsr = RSR_ALLBITS;", because I will need RSR
> register
> > value later
> > 3. in /cpu/mpc8260/serial_smc.c, we use BRG1 for SMC1 instead of BRG7
>
> You are not supposed to meddle with these files. No changes to such
> common files are necessary to port U-Boot to custom hardware.
>
> > 4. in /include/mpc8260.h, we add a hardware dog kick function, and
> modified
> > functiion "reset_8260_watchdog" a little to kick the hardware dog.
> > 5. in /common/main.c, we add support to the two jumper on our board,
> which
> > is just two "if... else...".
>
> Such changes should be done in board specific code, not in common
> files.
>
> > 6. in our board specific files, they all works fine before and I did not
> > change a thing.
> > Make all the changes above, the u-boot works fine. then I modified the
> > /common/cmd_mem.c, we make the mtest command to test memory only once(in
> > CFG_ALT_MEMTEST mode).
> > I change the "for(;;)" to for(;iterations == 1;)", then the "Unknown
> Flash
> > Bank" happens.
> > I printed out the 4 Flash IDs, the Manufacture Id changes from
> 0x01(normal)
> > to 0x808(wrong!!), other IDs are all normal.
>
> This makes zero sense to me.
>
> I understand you have a custom board with local modifications. That
> means we don't know neither your hardware nor your code, which makes
> it impossible to help. From the symptoms you describe, there must be
> something fundamentally broken with your port, but without seeing your
> code we cannot even guess what this might be.
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> The high cost of living hasn't affected its popularity.
>