Rockbox mail archiveSubject: Survey wrapup (who has a non-V1 boot ROM?)
Survey wrapup (who has a non-V1 boot ROM?)
From: [IDC]Dragon <idc-dragon_at_gmx.de>
Date: Sun, 28 Sep 2003 21:50:52 +0200 (MEST)
Hi and thanks to the participants,
seems there are not too many out there, only 3 reported. Together with the
prevously discovered ones that makes 9.
Stupid me: These days I found out that the ROM dump is identical to the the
first part of the flash dump. Which leads to the conclusion that these boxes
have (or use) no boot ROM at all, have instead the flash mirrored to address
0. And having a closer look into the flash this makes sense, it starts with a
vector table, then code.
This is bad news, unless the boot ROM is hidden and can be re-enabled, these
boxes have no such thing as a recovery option via UART boot. On the other
end, for most people this probably would make no practical difference, the
required mods are not suitable for everybody anyway.
Developing a working dual boot loader for these would require me to
temporarily modify my box to optionally start from flash_at_0, too. If it's not OK, I
could switch back and UART-reflash. This is days of work (including the .rock
changes), I'm afraid I'm not gonna go ahead with it.
One more thing worth finding out: maybe these boxes have a SH7032 CPU, the
romless version with double IRAM size, instead of the usual SH7034. Has
anybody opened it up? Would also be interesting to re-enable the boot ROM, can be
done with resistors on the mode pins. Or I'll add some code to the H/W info to
find out IRAM size.
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