Difference between revisions of "Boot Chain"
Hopspitfire (talk | contribs) |
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'''Load Address''': 0x40200000 | '''Load Address''': 0x40200000 | ||
| − | This does some minimal hardware initialization, then loads the "real" bootloader and executes it. The "real" bootloader is tacked onto the end of boot.bin as a gzip, | + | This does some minimal hardware initialization, then loads the "real" bootloader and executes it. The "real" bootloader is tacked onto the end of boot.bin as a gzip. The offset of the "real" bootloader is different for every version. Table below will give you the right offset |
| + | (If your version is not listed, then search with "hexdump -C boot-castle.bin | less" for the byte sequence "1f 8b" (the gzip format identifier)). | ||
| + | |||
| + | <table cellpadding="2" cellspacing="0" style="text-align:left;border:1px solid #d4d4d4;"> | ||
| + | <tr style="background-color:#F1F1F1;"> | ||
| + | <td style="border-bottom:1px solid #d4d4d4;border-right:1px solid #d4d4d4;">Version</td> | ||
| + | <td style="border-bottom:1px solid #d4d4d4;">Offset</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td style="border-right:1px solid #d4d4d4;border-bottom:1px solid #d4d4d4;">unknown</td> | ||
| + | <td style="border-bottom:1px solid #d4d4d4;">0x19D0 (thanks roxfan)</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td style="border-right:1px solid #d4d4d4;border-bottom:1px solid #d4d4d4;">1.3.1 (O2)</td> | ||
| + | <td style="border-bottom:1px solid #d4d4d4;">0x19f0</td> | ||
| + | </tr> | ||
| + | </table> | ||
| + | |||
== "real" bootloader ([[bootie]])== | == "real" bootloader ([[bootie]])== | ||
Revision as of 08:42, 14 December 2009
boot/boot.bin
Load Address: 0x40200000
This does some minimal hardware initialization, then loads the "real" bootloader and executes it. The "real" bootloader is tacked onto the end of boot.bin as a gzip. The offset of the "real" bootloader is different for every version. Table below will give you the right offset (If your version is not listed, then search with "hexdump -C boot-castle.bin | less" for the byte sequence "1f 8b" (the gzip format identifier)).
| Version | Offset |
| unknown | 0x19D0 (thanks roxfan) |
| 1.3.1 (O2) | 0x19f0 |
"real" bootloader (bootie)
Load Address: 0x82000000
This looks a _lot_ like iBoot from the iPhoneOS devices, but others say that this is based off u-boot, so I will assume that is true and that iBoot is also based off of it. It even seems to have some of the u-boot commands, such as "printenv", "run", "setenv", "getenv", etc. I am currently looking into how to communicate with it as you can with iBoot.