Hi,
On 11/20/2014 08:41 PM, Suriyan Ramasami wrote:
Hello Simon,
On Nov 20, 2014 8:38 AM, "Simon Glass" sjg@chromium.org wrote:
Hi,
On 20 November 2014 16:04, Hans de Goede hdegoede@redhat.com wrote:
Hi Suriyan,
On 11/20/2014 04:16 PM, Suriyan Ramasami wrote:
Hello Simon, This mail is addressed to you as the FDT support was added by you. I am not sure who else to address it to.
Just to be clear, I didn't add FDT support, this predates my involvement in U-Boot. I added CONFIG_OF_CONTROL etc. though. Han's solution sounds good to me.
Sorry about that. In no way was I accusing you :-) I stand corrected though.
I find that if CONFIG_OF_LIBFDT is defined then the user isforced to provide a FDT blob. In most of the cases it makes sense. However, this removes the ability to boot older linux (non FDT). For example, I was looking at the Hardkernel Odroid kernels for the U2/U3, and they are 3.8 based. Of course newer kernels 3.17 work. For users to use the same boot loader for 3.8 and for 3.17, they cannot use the mainline uboot.
I've hit the same problem myself recently, see the thread titled:
"Booting non devicetree enabled kernels using u-boot build with
CONFIG_OF_LIBFDT"
I was wondering if teh third argument to bootz/bootm etc couldalso take the route of initrd (optional if - is specified) could be implemented.
The fix seems to be trivial (or so I think), in file common/image-fdt.c, but wanted to know your comments on this. Also the command help (for bootz etc) states that if the 3rd argument is not passed, then the bd_info struct is passed, and I do not see it being passed in the code anywhere. In the absence of the third parameter, it just gives a "No fdt found" message.
Thanks for working on a fix, as discussed in the earlier thread,
requiring
a third argument which is '-' will break old boot.scr files and the
likes,
so a better fix is to:
- Always try to find an ftd (to keep things like appended ftd-s
working)
- If not found see if there is a third argument, if there is, treat
this
as a fatal error, abort the bootm (iow behave as before) 3) If there is not a third argument warn and continue as before.
If you could respin your patch to do this, then that would be great.
Hello Hans/Simon, I have been tracing the code paths and see that function bootm_find_fdt() is the final fdt prep function. To retain all its previous functionality, but introducing a warning condition if no third argument is present, but go ahead and boot without fdt should keep the peace. The easiest way to achieve this is: (takes care of 2 and 3 above)
diff --git a/common/image-fdt.c b/common/image-fdt.c index a39ae1b..1a02166 100644 --- a/common/image-fdt.c +++ b/common/image-fdt.c @@ -430,6 +430,10 @@ int boot_get_fdt(int flag, int argc, char * const argv[], u error: *of_flat_tree = NULL; *of_size = 0;
if (argc <= 2) {debug("Continuing to boot without FDT\n");return 0;} return 1;}
For case 1, is this already handled in the code?
Yes it is, so your above patch should do the trick nicely, thanks for working on this.
Can you re-send as a proper patch, with commit message, rather then inline in a mail ? (Please use git send-email if possible).
Regards,
Hans