Hi Maxim, On 9 September 2016 at 15:53, Maxim Sloyko <max...@google.com> wrote: > > Hi all, > > First, disclaimer: this is the first time I'm doing something with U-Boot or > the part (ast2500), so any claim I make below can be false or just plain > nonsense.
Welcome! > > I'm working on expanding support of Aspeed ast2500 part in U-Boot. > > I ran into some problems, when I tried to use Linux Kernel device tree for > this part in U-Boot. Looking at diagnostic messages > (http://pastebin.ca/3713876) I figured out that the problem is that U-Boot > continues to use malloc_simple, even after it has been relocated to RAM. As a > result, it fails to allocate 130k needed for environment, because it is > larger than the configured size of a memory chunk for simple malloc. The test for this is in dlmalloc.c - the GD_FLG_FULL_MALLOC_INIT flag. The flag is set in initr_reloc() after relocation. I wonder if your global_data (the 'gd' pointer) is not set up correctly, so it cannot write to the flag. What version of U-Boot is it? Is the tree available somewhere? > > I suspect that this has something to do with memory configuration, do you > know what I may be missing? Also, it looks like lowlevel_init has been called > twice, i.e. again after relocation -- is this expected? This might be what is > causing the problem, because lowlevel_init does a lot of RAM related > configuration, but I don't know what to do about it. I would expect lowlevel_init() to be called only once (or perhaps once in SPL and once in U-Boot proper). > > There is some very basic support for this part in U-Boot, provided by > manufacturer, but it is basically a single platform.S assembly file that does > everything, like RAM configuration and some other peripherals support in > lowlevel_init procedure. > > So, if I want to add proper support for this part, i.e. with device tree and > all, is there a way to make this a gradual process? I mean, is it possible to > leave existing RAM initialization procedure in lowlevel_init and just add new > drivers for something I'm interested in or is this all or nothing kind of > thing? Yes you can do things gradually. If you have a sane early memory environment then you shouldn't have much trouble. > > Thank you. > > -- > Maxim Sloyko Regards, Simon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
