Editing Minimig Harddisc

== SCSI ==
== P-ATA ==
[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=38888&forum=8&viewmode=flat&order=ASC&start=80 ivier 070801]:<br>
:Gayle style IDE is very simple, i've been looking into it. though bluea would probably be the best person to ask about it, he has it working on natami i believe. Most of the signals come straight from the CPU, which means very few FPGA pins will be needed.
:
:from what i can see, the only lines that dont come straight from the CPU are.
::IDE_CS1
::IDE_CS2 (usually only used by IDE doublers, can probably be left out)
::IDE_IRQ (not needed when interfacing drives to MCU's, not sure whether scsi.device needs it)
::IOWR
::IORD
::WAIT
:
:what do you know... exactly 6 extra lines
:
:The data lines are byte swapped
:And IDE_A0 - IDE_A2 are mapped to A2 - A4
:finally, IDE_LED, optionally goes to an LED.
:
:an IDE only mode compact flash port, could easily be added to the bottom side of the board. :Giving us access to 1.8" hard drives.

freqmax:
[http://www.hardwarebook.info/ATA_Internal Internal P-ATA connector pinout]
:out: CS1, CS2,IOWR, IORD
:in: IRQ, 
:hmm?  WAIT


[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=38888&forum=8&viewmode=flat&order=ASC&start=80#forumpost461819 mrmkl 070803]
:http://www.iki.fi/mkl/ide/

== S-ATA ==
S-ATA PHY IP-Core:<br>
http://www.softmixedsignal.com/smssata.pdf

== Software aspect ==
[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=38888&forum=8&viewmode=flat&order=ASC&start=80 Crumb 070802]:
:[http://en.wikipedia.org/wiki/UAE_%28emulator%29 UAE]'s Hardfile format. In addition to UAE's normal hardfile format (that works as a simplepartition) UAE also has the option of making an entire HD image, including [http://en.wikipedia.org/wiki/Rigid_Disk_Block RDB].
:Starting from kickstart 37.300 (I think it's Rom 2.05, earlier releases had a bug and didn't detect it) the controller is supported and code is built-in in the rom.
:
:For kickstart 1.3 I guess that a driver would be required, simulating an autoconfig HD controller or maybe it would be enough to extract the rom from KS and make a custom 1.3 rom... but I guess I could live without HD emulation on OS1.3 since OS 2.05/3.1 could be loaded in the same board with just a reset.
:
:I guess Gayle emulation would be perfect. Maybe Thomas Hirsch aka "bluea" could give some hints. He has implemented Gayle emulation for his NatAmi project. I don't know if he'll release some code. Anyway here you have some interesting info about Gayle:
:http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=31439&forum=8#forumpost378020
:He got it working. According to him "I implemented the A4000 and A1200-Gayle registers as a Chip-Select logic for an 2.5" harddisk. So I can boot from that drive."
:
:-edit- BTW, if a 16 or 32MB memory chip was used there would be room to have 2MB of chip, 8MB of fast and also some "slow-ranger-pseudofast" ram. In addition to the FPGA code and AmigaOS Rom (the fpga code could be changed to accept 1MB roms like CD32/A1200) the rest of ram could be used as buffers for the hardfile. That way disk access shouldn't be too slow.

[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=31439&forum=8#forumpost378020 alexh 060603]:
http://groups.google.co.uk/group/fa.linux.680x0/browse_thread/thread/33e6f8f26d5bc63c/16cd017fdd8c71e2?lnk=st&q=amiga+gayle+address+register&rnum=1&hl=en#16cd017fdd8c71e2<br>
[http://www.mail-archive.com/linux-m68k@vger.kernel.org/msg00053.html Re: Gayle IDE register offsets mail-archive.com]
[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=31439&forum=8#forumpost378020 mrmkl 070803]:
http://aminet.net/search?query=hddmem<br>
[http://www.iki.fi/mkl/ide/ P-ATA interface for the MC68000 cpu socket]<br>
[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=39867&forum=8 amiga.org Largest Capacity Hard Drive In A600?]

Software hardfile support suggestion:
:Define "struct adfTYPE dh0;"
:Update User() to handle selection 'dh0' aswell. Current implementation decides you ALWAYS want 'df0'
:Make HandleFpgaCmd() to take more parameters and make them variable size per request.
:Modify ReadTrack() such that it doesn't presume 11 sectors per track.
:Make a SectorToFpga() function that don't stuff sector header formatting into the transfered sector.
:The rest is to make the FPGA to present the SPI transfered sectors to appear magicly from the Gayle ide controller via SPI.

[http://portal.acm.org/ft_gateway.cfm?id=358425&type=pdf&coll=ACM&dl=ACM&CFID=15151515&CFTOKEN=6184618
 Timating file access time of floppy disks, acm.org]<br>
[http://www.powerspec.com/systems/archives/system_components.phtml?component=73&selection=8420 Floppy characteristics powerspec.com] Track-to-Track is ~3 ms<br>

== See also ==
* [[Minimig Expansion]]
@@ Line 55: / Line 55: @@
 [http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=39867&forum=8 amiga.org Largest Capacity Hard Drive In A600?]
-== Software simulated hardfile with Gayle interface ==
 Software hardfile support suggestion:
 :Define "struct adfTYPE dh0;"
@@ Line 67: / Line 66: @@
   Timating file access time of floppy disks, acm.org]<br>
 [http://www.powerspec.com/systems/archives/system_components.phtml?component=73&selection=8420 Floppy characteristics powerspec.com] Track-to-Track is ~3 ms<br>
-[http://www.amiga.org/modules/newbb/viewtopic.php?topic_id=31439&forum=8#forumpost378020 amiga.org Gayle Hardware Registers]
-[http://groups.google.co.uk/group/fa.linux.680x0/browse_thread/thread/33e6f8f26d5bc63c/16cd017fdd8c71e2?lnk=st&q=amiga+gayle+address+register&rnum=1&hl=en#16cd017fdd8c71e2 Gayle IDE register offsets google.co.uk]
-<pre>
-Addr on A1000+  Addr on AT Valid Data Read Function    Write Function
-$0DA1018        3F6         8 bits    Alternate Status Device Control
-$0DA101C        3F7         8 bits    Drive address    Not used
-$0DA0004        1F1         8 bits    Error Register   Features
-$0DA0008        1F2         8 bits    Sector Count     Sector Count
-$0DA000C        1F3         8 bits    Sector Number    Sector Number
-$0DA0010        1F4         8 bits    Cylinder Low     Cylinder Low
-$0DA0014        1F5         8 bits    Cylinder High    Cylinder High
-$0DA0018        1F6         8 bits    Drive/Head       Drive/Head
-$0DA001C        1F7         8 bits    Status           Command
-$0DA2000        1F0        16 bits    Data             Data
-</pre>
-[http://fxr.watson.org/fxr/search?v=NETBSD&string=gayle NetBSD Gayle matches watson.org]
-arch/amiga/amiga/gayle.c
-:#define GAYLE_PHYS_ADDRESS      0xda8000
-http://fxr.watson.org/fxr/source/arch/amiga/dev/wdc_amiga.c?v=NETBSD#L82
-http://fxr.watson.org/fxr/source/arch/amiga/dev/gayle_pcmcia.c?v=NETBSD#L102
-http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/amiga/amiga/gayle.c?rev=1.6&content-type=text/x-cvsweb-markup
-http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/amiga/dev/gayle_pcmcia.c?rev=1.22&content-type=text/x-cvsweb-markup
 == See also ==
 * [[Minimig Expansion]]