Wolfgang Denk wrote:
> Dear Timur Tabi,
>
> In message <ed82fe3e1003050915r6e677102mb47a448293e62...@mail.gmail.com> you
> wrote:
>> Can someone tell me what CONFIG_HAS_DATAFLASH does?
>
> I know this sounds like an act of darin, but how about having a look
> at the README ?
>
> [And I really wonder why you did not find the documentation there.]
CONFIG_HAS_DATAFLASH
Defining this option enables DataFlash features and
allows to read/write in Dataflash via the standard
commands cp, md...
This doesn't tell me anything.
>> The reason I ask is that I'm trying to use
>> CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS, but I noticed that the "md"
>
> Why would you want to do that? This is only needed in very special
> situations which involve a state of hardware that can be best
> described as broken.
You're right. The board I need to support is broken, IMHO. Fortunately,
CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS provides a reasonably elegant fix.
>> command does not use the flash_readX primitives when I ask it to
>> display memory from a flash address. In examining do_mem_md(), I
>> noticed CONFIG_HAS_DATAFLASH.
>
> Did you? I don't see any CONFIG_HAS_DATAFLASH anywhere in cmd_mem.c
int do_mem_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
ulong addr, length;
#if defined(CONFIG_HAS_DATAFLASH)
ulong nbytes, linebytes;
#endif
I'm not imagining things.
> And this is expected - the "md" command is, as the name suggests,
> intended for Memory Dumps. "Memory" is defined as something that can
> be read by just putting the address on the address bus and reading
> the corresponding data from the data bus, without need for any
> additional code or access protocols. On hardware where
> CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS is needed, you cannot really
> apply the term "memory" to such a flash device - it is a storage
> device, but not more.
Fair enough, but I was hoping there'd be an easy way to get md to work.
--
Timur Tabi
Linux kernel developer at Freescale
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