First, it works with some SD cards. It does not work with SDHC and SDXC cards. So your's card must be less then 4G and must not be marked as SDHC or SDXC. It may work with MMC, or may not, I've not tested
Next, card must be from 128M (never tried) to 2G
Tested: Kingston SD/512 (with some tropic isle on it), Apacer 1G AP1GSD60, some 2G MicroSD (Transcend or Kingston?) - all that works. I was unable to init Toshiba SD-M16 16M card, do not understand why.
Next, I do not provide ROM code for loading, this is forthcoming, read more to find how to load it.
Currently, TPA is limited to 48k (actually it detects as 51206 bytes, that's right), I'll raise it somehow
Hotplug is not supported and I believe never will be
As for my own setup, I have 2.4576MHz quarts/38400 baud serial interface, RS232 connection on channel 2
of SIO. I think it should work with channel 1, cause I preserve passing IOBYTE from monitor, and I think it
should work in 7Mhz or even higher (or lower) (maybe you'll get "Cannot Init SD" by loader; try to load
it once again)
UPD: It works on 7Mhz, as expected
Making bootable SD card
Compiling under linux (and generally unix, I've tried MacOSX 10.4/ppc too):
if you do not want to compile, skip to here
First, get tpasm http://www.sqrt.com/ ftp://ftp.ct0.com/pub/tpasm.tgz
(or check my site - I probably have a mirror)
Next, install (or check you have installed) TCL, 8.3 and later is ok, maybe 8.2, I do not remember if 8.1 ok. I
use it as a part of linking tools (mload.tcl), or you may rewrite it the way you like.
cd BDOS
./MakeBDOS
You'll get cbios.hex and labels.lst
Check labels.lst for you have exceeded 64k. hstBufEnd must be less FF00.
If not, you have to lower TPA. If you have 48k TPA currently, you are in BIG trouble
Next, compile CP/M by MakeCPM , you'll get cpm22.hex
Next, create system by ./createimage , you'll get image.img.
It takes some time. It takes significant time on MacOSX 10.4 @ iBook G3/500 !
Making boot media
Then, check your SD is SD, not more 2G, insert your's SD card in reader, find it as /dev/sdX,
be very carefull, because if you write this to your's boot drive, you'll make it unusable.
Became root and write filesystem to SD (~16M)
dd if=notempty.img of=/dev/sdX
Next, write the system to the first track of SD
dd if=image.img of=/dev/sdX
The distribution may contain different system images, number probably indicates TPA,
D means debug, avoid it
if you no not need debug.
Booting and loader
Start your's SBC, locate some loader.hex in distribution set and paste it into terminal window, then
G5000 it.
If you see "Initing MMC",
Cannot send CMD1
G5000 it once again. (this still happens with one of my SD cards; it's not critical,
I'll fix in on next release)
I'll provide some ROM image, later
Implementation notes
The implementation is delivered from Grant Searle work, so it shares almost everything.
In Grant's CF BDOS, system is loaded from offset 0 of CF card - it takes $3000 bytes of $4000 bytes of the
whole track-0 - to $D000 - $FFFF memory locations.
In my SD BDOS I load the whole $4000 bytes from track-0, but it does not mean
the system always should be $4000 bytes - it may be shorter, saying $3000 bytes system should start from $1000
offset of SD card.
Feedback
Use http://z80xxi.livejournal.com/ for feedback
Distribution set
Distribution set naming
sgsbcsdYYMV.tar.gz
sgsbcsd is the name of the project, YY is decimal years from 1990 (as for all DtZ's software), M
is [1-b] month,V is [0-9a-z] release of the file
sgsbcsd2323.tar.gz Relink release 0.00.01 / 2323
CE00/55046 TPA version relink release and minor changes in loader
For assemling use BIOS/MakeBDOS_CE00 , next MakeCPM_CE00, next createimage_CE00
sgsbcsd2322.tar.gz Bugfix release 0.00.01 / 2322
Notice: 20130204 looks like error caught, wait for bugfix release
Notice: bugfix release sgsbcsd2322.tar.gz is expected 20130203-20130205
Notice: looks like it have errors in current and fothcoming release ;-) on write block (and possibly warm boot)
- if you use debug version of system you may help
sgsbcsd2321.tar.gz Initial release 0.00.01 / 2321