The SPL, or Second Program Loader, is essentially the Android bootloader. It's job is more than just loading the Android OS - it also offers several other boot options, including Recovery mode, Fastboot, and HBOOT modes, and ultimately it's the SPL that allows manipulation of the flash nand on your device. Part of the SPL's job is to ensure that the data flashed to the device is correct. Most of the current shipping SPLs (apart from the "erfect SPL's) let us flash a complete ROM image, but don't let us flash a recovery rom or boot image as it checks the verification signature. Haykuro has modified the SPL's available to remove this check and this is what the Engineering SPL's available offer. As the SPL is so crucial to the handset though, you have to be very careful when flashing it as if it's updated incorrectly then you may be incapable of restoring it without specialised hardware and knowledge. You essentially have a very expensive brick ;)
from：http://wiki.xda-developers.com/i ... TC_Sapphire_Hacking
xda-developers.com 是国外比较著名的HTC手机论坛，英文好的，可以在这个论坛和他的wiki 淘到好的东西，
这里是Original SPL list : （from：http://forum.xda-developers.com/showthread.php?t=529019 ）
Please update us on any new SPL's so we can include them in this list.
- HBOOT-1.33.0004 (SAPP10000) : Sapphire PVT 32B SHIP S-ON G : CPLD-10 (Voldafone NL + UK + Australia)
- HBOOT-1.33.0008 (SAPP10000) : Sapphire PVT 32A SHIP S-ON H : CPLD-12 (TIM (Italian))
- HBOOT-1.3300.0009 (SAPP10000) : Sapphire PVT 32A SHIP S-ON H : CPLD-12 (Nordic Magic A6161)
- HBOOT-1.33.0009 (SAPP10000) : Sapphire PVT 32A SHIP S-OFF H : CPLD-12 (Belgian HTC)
- HBOOT-1.33.0009 (SAPP10000) : Sapphire PVT 32A SHIP S-ON H : CPLD-12 (Greek)
- HBOOT-1.33.0009 (SAPP50000) : Sapphire PVT 32A SHIP S-OFF H : CPLD-11 (Rogers)
- HBOOT-1.33.0009 (SAPP50000) : Sapphire PVT 32A SHIP S-ON H : CPLD-12 (Rogers)
- HBOOT-1.33.0010 (SAPP10000) : Sapphire PVT 32A SHIP S-ON H : CPLD-12
- HBOOT-1.33.3004 (SAPP30000) : Sapphire PVT 32B DEV S-ON G : CPLD-10 (ION)
- HBOOT-1.33.3005 from the Japanese ION
Haykuro quote : "T-Mobile myTouch : 1.33.0006 and 1.33.0010 is the dreaded "perfected" SPL".
This means that it's currently not possible to run "fastboot boot image" on these SPL's, so don't try to flash them.
==（1.33.0006 and 1.33.0010 目前还没被破解，就不能刷fastboot boot image"）
SPL Info
- The G or H at the end identify if it's a Google or HTC SPL
- ENG : Engineering version
- SHIP : Shipment version
- DEV : Development version (ION)
- S-off and S-on : Security on and off (writing directly to nand or not) , most probably not SPL linked.
- PVT 32A (HTC branded) : 288MB RAM / Qualcomm MSM7200a? ?? ?? ???==（主板类型）
- PVT 32B (Google branded) : 192MB RAM / Qualcomm MSM7201a
- CPLD XX : What does this mean?
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2012-03-10
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erfect SPL's) let us flash a complete ROM image, but don't let us flash a recovery rom or boot image as it checks the verification signature. Haykuro has modified the SPL's available to remove this check and this is what the Engineering SPL's available offer. As the SPL is so crucial to the handset though, you have to be very careful when flashing it as if it's updated incorrectly then you may be incapable of restoring it without specialised hardware and knowledge. You essentially have a very expensive brick ;)