Hi Lists, On Fri, 4 Nov 2022 at 04:26, Lists Nick Betteridge <lists.nick.betteri...@gmail.com> wrote: > > Hi Simon, > > Thanks for getting back to me > > >> > >> I'm developing on an ubuntu x86 machine, trying to run the u-boot > >> hello_world standalone application which resides on an image |sd.img| > >> which contains a partition > >> > >> I've compiled u-boot (|v2022.10|) with |qemu-x86_64_defconfig| > >> > >> I run qemu with "|qemu-system-x86_64 -m 1024 -nographic -bios u-boot.rom > >> -drive format=raw,file=sd.img"| > >> > >> u-boot starts up, doesn't find a script, doesn't detect tftp, and awaits > >> a command. If I type |"ext4ls ide 0:1|", I can clearly see > >> hello_world.bin (|3932704 hello_world.bin|). > >> > >> When I do a |ext4load ide 0:1 0x40000 hello_world.bin| (in preparation > >> for |go 40000 This is another test|), qemu/u-boot restarts. > >> > >> 0x40000 is the |CONFIG_STANDALONE_LOAD_ADDR| for x86. > >> > >> I have also tried making an image of hello_world |"mkimage -n "Hello > >> stand alone" -A x86_64 -O u-boot -T standalone -C none -a 0x40000 -d > >> hello_world.bin -v hello_world.img|" and tried to load the image into > >> 0x40000 with the intention of using |bootm| in case of cache issues - > >> qemu/u-boot still resets. > >> > >> Could anyone possibly point out the basic mistake I'm making? > > > > Is the app linked to start at that address. Could you try 'dcache off' > > before the 'go'? Do you have a debugger? > > > > The standalone Makefile sets up the start address at 0x40000 > (CONFIG_STANDALONE_LOAD_ADDR), so I'm assuming that hello_world.bin is > correctly linked to that address. > > I'm unable to even try 'dcache off' before 'go' as the 'ext4load' at > CONFIG_STANDALONE_LOAD_ADDR causes a restart. > > As I mentioned to Tom Rini, all I'm trying to do at the moment is > develop a standalone program using u-boot and qemu on my x86 ubuntu > machine and then target a platform (riscv or arm) at a later date. > > Thanks again for your reply
Does qemu have RAM at 0x40000? Can you use 'md' to check that region? I am not sure why it is restarting when you load something there, but that might be unrelated to U-Boot and more to do with QEMU? Regards, Simon
