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Update PiSCSHI readme

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Add/correct some information, remove any notes about it being work in progress.
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platforms/amiga/piscsi/readme.md
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A high performance replacement for scsi.device, allowing automatic booting and mounting of raw hard disk (RDB/RDSK) images.
While this driver is considered mostly stable, it's still work in progress. Do not use it in conjunction with any critical one of a kind data that you need to survive.
While this driver is considered mostly stable, you should not use it in conjunction with any critical one of a kind data that you need to survive.
# Compatibility
* PiSCSI **requires** some Fast RAM to be mapped on your PiStorm to work.
* This may change at some point, but for now make sure that you configure at the very least a few megabytes of Fast RAM so that the boot ROM can load and initialize properly.
* ~~PiSCSI **only** supports **512 byte** block size for virtual SCSI devices.~~
* ~~The block size is hard coded, this will probably be addressed relatively soon (TM). If you need very large partitions, please use PFS3AIO or a similar file system instead of FFS.~~
* ~~Selecting a different block size may appear to work in some cases, but in reality it does not. Do not change the block size from the default 512 bytes.~~
* `[WIP]` Theoretically, PiSCSI should now be compatible with any block size up to 64KB, but this is not very thoroughly tested when you are reading this particular piece of text.
* PiSCSI **requires** emulation of a 32-bit CPU to be used. It will not work when using 68000, 68010 or 68EC020 emulation.
* Theoretically, PiSCSI should now be compatible with any block size up to 64KB, but this is not very thoroughly tested when you are reading this particular piece of text.
* Autobooting, Kickstart 2.0 and up
* PiSCSI does NOT work with Kickstart 1.3 yet, as it is missing some code needed to properly add boot nodes with old Kickstarts.
* Enabling PiSCSI without mapping any drives on 1.3 will however give you 128MB of Fast RAM, as long as you leave the default Z3 Fast RAM mapping enabled.
* Mounting RDSK/RDB disk images, physical devices with a file system the Amiga can use
* PiSCSI **does NOT** work with **specifically UAE single partition** disk images prepared and formatted using WinUAE yet. You can check what type the disk image is using a hex editor, if it starts with `RDSK`, it is a full drive RDSK/RDB image, if it starts with `DOS` it is most likely a UAE single partition disk image.
* It **does** however work with any UAE disk image prepared using the **Full drive/RDB mode** selected in the Hardfile settings. Using **Full drive/RDB mode** in for instance WinUAE requires you to click the button labeled with this exact piece of text.