Dear Simon,
In message <capnjgz38hpmof07cmyssa1q167srjzdpbbubcvmaogdrowe...@mail.gmail.com>
you wrote:
>
> Thanks for looking at this so closely - it's just an RFC at this
> stage, but I think it has promise.
Agreed.
> > I think config_* is not a good name to use here - it has never been a
> > reserved prefix so far, so it is IMO a bad idea to turn it into one
> > now . We already have quite a number such variable names in the code
> > all over the place (not sure I caught them all):
...
> These are variables, so won't conflict with the function macros used
> by this patch. But maybe we should try for something like cfg_...()?
You are wrong. This includes a number of functions, and macros, too,
for example:
void config_sdram(const struct emif_regs *regs);
void config_ddr_phy(const struct emif_regs *regs);
void config_cmd_ctrl(const struct cmd_control *cmd);
void config_ddr_data(int data_macrono, ...)
void config_io_ctrl(unsigned long val);
void config_ddr(unsigned int pll, unsigned int ioctrl,
void config_data_eye_leveling_samples(u32 emif_base);
static int config_pll_clk(enum pll_clocks index, ...)
static int config_core_clk(u32 ref, u32 freq)
# define config_fifo(dir, idx, addr)
And cfg_ is not much better:
#define cfg_read(val, addr, type, op)
#define cfg_write(val, addr, type, op)
u16 cfg_type = 0;
unsigned cfg_val;
u32 *cfg_reg;
uint cfg_addr;
uint cfg_data;
...
> I did for the 'sed' step - it was a 2-3 seconds to regenerate the header
> files.
>
> Full reconfig/recompile goes from about about 30s to 34s.
> Incremental build doesn't change noticeably.
I'm mostly concerned about build time for the autobuilder, which does
full config / build cycles for all boards. Here more than 10%
increase hurt...
> I also tried recompiling both the mainline U-Boot's main.c 100 times,
> and then this one. I could not see any time difference, which is a
> little surprising. Maybe the C compiler's DCE is pretty early in the
> the process?
This is a surprising result, indeed.
> >> + if (config_autoboot_delay_str() && delaykey[0].str == NULL)
> >> + delaykey[0].str = config_autoboot_delay_str();
> >
> > Hm.... constructs like these make me think about side effects. As is,
> > your implementation does not pretect against any. This may be
> > dangerous - you are evaluating the macro multiple times now, while
> > before it was only a defined() test, folowed by a single evaluation.
You did not comment on this remark. I think it is something to keep
in mind!
> > And to be honest - I find the old code easier to read.
:-)
> But if you have time, please take a look at the sed scripts and the Makefile.
Sorry, but I can't find the audacity to bend my mind around these
currently ;-)
But you might have a look at "tools/scripts/define2mk.sed" and either
use this as is, or base your code on this. I would find it good to
use the same code for the same (or so very similar) purposes.
> The background here is that I have been wondering about this for a
> while, but have never really come up with a good way (in the absence
> of a unified Kconfig) of getting a complete list of CONFIG variables.
Does not the already existing "include/autoconf.mk" contain this
information? In any case, please check "tools/scripts/define2mk.sed"
> There was a mailing list post about this a few weeks ago. But then
> David Hendrix complained about main.c which spurred me into action,
> and I thought maybe we could just live with a brute force
> 'find/grep/sed' approach for now, rather than trying to be too clever.
> That's what I have done here.
Understood, and appreciated.
> I will come back to this when I have time - will be a week or two.
Thanks.
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: w...@denx.de
If you think the problem is bad now, just wait until we've solved it.
Epstein's Law
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