On Wed, Jan 25, 2012 at 11:00:34PM +0100, Marek Vasut wrote: > > 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. > > What do you mean, you don't need xloader, u-boot SPL can replace it.
Yes and no. No, becaue you nor I have no Nokia's signing key(s) to sign SPL binary for OMAP's secure boot ROM. IIRC N950/N9 is even more strict regarding that, am I right? > > > > 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. > > I know. So ... ? Basically you can use the TI flashes too since it all goes > through the bootrom, right? Butrom requires signed binary. > > > > 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). > > Why? Where? You know you can debug U-Boot in QEMU with GDB and diag the > problem > properly? Any volunteers? (I own N900 too, ah, I own 3 of tham, damnit) > > > > > 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. > > Yes you can, either observe it or disas it. > > M All the best, S. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
