[Coco] Just another peek...

[Brett Gordon]

If you're selling them all-set-to-go,  I am interested in purchasing
one anyway regardless.  Anyway,  If someone has written the HDBDOS
driver, and the OS9 driver, would they not be the more logical ones to
write the BOOT driver?  After all: the BOOT driver is one of the
simplest of the three to write.

As far as the repos go, I don't see SDIO drivers in either HDBDOS ?

I just checked Fuzix's driver for SDIO, and they compile down to about
1400 bytes.  This is mostly C source, though, and I'm sure we can get
it smaller.




On Sat, Oct 10, 2015 at 9:18 AM, Dave Philipsen <dave at davebiz.com> wrote:
> You can consider numbers 1 and 3 as effectively done already. As for fitting BOOT into 768 bytes or less I'm not 100% sure on that. It may be possible...
>
> Dave Philipsen
>
>> On Oct 10, 2015, at 6:16 AM, Brett Gordon <beretta42 at gmail.com> wrote:
>>
>> In order to do stand-alone SD booting, the current OS9 two-stage boot
>> does indeed require 3 drivers be written:
>>
>> 1. One for HDBDOS/DECB
>> 2. One for the boot loader (BOOT)
>> 3. One for the Nitros9 run-time. (I guess someone did this already)
>>
>> *Someone* here wrote a OS9 ROM booter effectively combines nos. 1 and
>> 2 into one driver. (but leaves you without DECB), and requires one to
>> monkey around with writing ROMs (which *is* pretty easy now-a-days)
>>
>> The current Nitros9 BOOT implementation requires any new drivers to
>> fit into 768 bytes of memory.  I'm guessing the SD driver would fit in
>> there (even with the hideousness of the SDIO initialization code).
>>
>> For writing any new driver, owning the subject hardware helps.  If I
>> get the gumption to do all the crap needed to get a CoCoFPGA, I *may*
>> help.  I've done the CoCoSDC drivers for HDBDOS.  And I don't think
>> the BOOT driver is too difficult, considering the unholy union that
>> BOOT/REL/KRN is. It's important to note though, because of our wacky
>> "eat-your-own" and "nay-saying" that happens in this community, any
>> coco programming I do now is for *myself*.  I will open-source it, of
>> course, but if I take any crap, I will drop it like a plagued rat.
>>
>> --
>> Brett M. Gordon,
>> beretta42 at gmail.com
>>
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>
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-- 
Brett M. Gordon,
beretta42 at gmail.com