On Wednesday 25 January 2012 22:29:16 Marek Vasut wrote: > > On Wednesday 25 January 2012 21:56:37 Marek Vasut wrote: > > > > On Wednesday 25 January 2012 19:20:01 Marek Vasut wrote: > > > > > So why not just replace the bootloader right away? > > > > > > > > Booting process on n900: > > > > 1. Omap bootrom > > > > 2. Nokia X-Loader > > > > 3. Nokia NOLO Bootloader > > > > 4. Linux kernel > > > > ... > > > > > > To make it clear, I own N900 myself ;-) > > > > > > > Nokia X-Loader and NOLO are stored in first nand part. It has size > > > > 128kB. Nokia X-Loader is signed (size 14.5kB), so cannot be replaced. > > > > NOLO bootloader is not signed (so theoretically can be replaced), but > > > > size is limited to 113kB. I do not know how to compile U-Boot binary > > > > with size < 113kB... > > > > > > > > Size of part where is stored linux kernel has 2MB and it is enought > > > > for > > > > U-Boot with kernel image (~200kB + ~1.6MB). Also U-Boot can boot > > > > kernel > > > > from eMMC/SD. > > > > > > You didn't answer my question, so again ... why can't you replace NOLO? > > > Because there's the 113kb limit? Use SPL then. > > > > I only tried to boot U-Boot in qemu wich increased boot part - but not > > worked. (NOLO in qemu can boot u-boot without problems). So NOLO do some > > extra work - which I do not know... Also limit is problem to test on real > > n900. > > What do you mean? Did you crack yours open? Can you connect JTAG to the > device? I didn't check on mine.
I have no idea if N900 has JTAG. And I think that nobody cracked X-Loader yet. NOLO bootloader can be replaced/flashed via flasher-3.5 app throw USB. Also when NOLO is damaged (or cleared/replaced) it can restored - coldflashed again via flasher-3.5. What I tried: I created mtd image where was X-Loader, NOLO and U-Boot. QEmu RX51 successfull booted this image and I got serial console and video screen output. But when I created mtd image where was only X-Loader an U-Boot, QEmu RX51 was unable to boot (it freezed). So NOLO executing some code which inilialize board or someting else which must be done in U-Boot board code. There is no documentation or info about NOLO, so I cannot create working NOLO replacement. -- Pali Rohár pali.ro...@gmail.com
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