[U-Boot] is there any issue with creating and using more than one hashtable?

[Robert P. J. Day]

On Sat, 1 Oct 2016, Wolfgang Denk wrote:

... snip ...

> Actually the TFTP will not access the environment directly to
> determine the boot parameters like bootfile, ipaddr, gatewayip,
> netmask, serverip, etc.; instead, it uses internal variables.  So
> your environment settings for "ipaddr" and "gatewayip" may contain
> totally different values than the variables net_ip resp.
> net_gateway which get used by the TFTP code.
>
> These variables get set through the U_BOOT_ENV_CALLBACK functionality,
> i. e. as a callback whenever the corresponfing variable gets set.
> "setting" here means that the value in the hash table gets changed -
> see function _compare_and_overwrite_entry() in "hashtable.c":
>
> 244                         /* If there is a callback, call it */
> 245                         if (htab->table[idx].entry.callback &&
> 246                             htab->table[idx].entry.callback(item.key,
> 247                             item.data, env_op_overwrite, flag)) {
> 248                                 debug("callback() rejected setting variable "
> 249                                         "%s, skipping it!\n", item.key);
> 250                                 __set_errno(EINVAL);
> 251                                 *retval = NULL;
> 252                                 return 0;
> 253                         }

... snip ...

  i'm going to assume other net-related commands have this behaviour
as well, yes? like ping? which would explain why ping'ing even the
alleged gateway didn't work in this context.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

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