Rockbox mail archiveSubject: Re: Survey wrapup (who has a non-V1 boot ROM?)
Re: Survey wrapup (who has a non-V1 boot ROM?)
From: Chris Muth <rockbox_at_muth.cc>
Date: Sun, 28 Sep 2003 16:33:58 -0500
Thanks for your effort to investigate these other boxes.
Looks like I got a box that will dim its backlight, but is not flashable.
Grr, what a trade off :-(
I am not suggesting that there is any connection, just what I got, and did not.
On 9/28/03 at 9:50 PM [IDC]Dragon wrote:
>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
>have (or use) no boot ROM at all, have instead the flash mirrored to
>0. And having a closer look into the flash this makes sense, it starts
>vector table, then code.
>This is bad news, unless the boot ROM is hidden and can be re-enabled,
>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
>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,
>done with resistors on the mode pins. Or I'll add some code to the H/W
>find out IRAM size.
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Received on 2003-09-28