Re: [PATCH v5] FIT: Parse `load` and `entry` addresses.

[Christian Mauderer <christian.mauderer@embedded-brains.de>]

Hello Sascha,

thanks for the review.

On 11/08/2020 09:57, Sascha Hauer wrote:
> Hi Christian,
> 
> On Wed, Jul 15, 2020 at 11:26:56AM +0200, Christian Mauderer wrote:
>> According to the U-Boot documentation for the FIT file format, the load
>> and entry have to be allways defined for a "kernel" or "standalone".
>> But Barebox ignored the parameters. That changes with this patch.
>>
>> For backward compatibility the default address is still used for images
>> without `load` or `entry`.
>>
>> Signed-off-by: Christian Mauderer <christian.mauderer@embedded-brains.de>
>> ---
>>  common/blspec.c     |  1 +
>>  common/boot.c       |  1 +
>>  common/bootm.c      | 24 ++++++++++-
>>  common/image-fit.c  | 97 ++++++++++++++++++++++++++++++++++++++-------
>>  include/image-fit.h |  3 ++
>>  5 files changed, 110 insertions(+), 16 deletions(-)
>>
>> diff --git a/common/blspec.c b/common/blspec.c
>> index 7fb62d310..050aed26a 100644
>> --- a/common/blspec.c
>> +++ b/common/blspec.c
>> @@ -142,6 +142,7 @@ static int blspec_boot(struct bootentry *be, int verbose, int dryrun)
>>  	globalvar_set_match("bootm.initrd", "");
>>  
>>  	bootm_data_init_defaults(&data);
>> +	data.os_entry = 0;
> 
> You set data.os_entry explicitly to 0 here...
> 
>>  
>>  	devicetree = blspec_entry_var_get(entry, "devicetree");
>>  	initrd = blspec_entry_var_get(entry, "initrd");
>> diff --git a/common/boot.c b/common/boot.c
>> index dcbe5cc2e..93ac1612d 100644
>> --- a/common/boot.c
>> +++ b/common/boot.c
>> @@ -104,6 +104,7 @@ static int bootscript_boot(struct bootentry *entry, int verbose, int dryrun)
>>  
>>  	bootm_data_init_defaults(&data);
>>  
>> +	data.os_entry = 0;
> 
> ...and here. Why is this done? I think these should be left to the
> default UIMAGE_SOME_ADDRESS. In the end the kernels bootet from blspec
> or a boot script could be a FIT image as well.
> 

You maybe noted that I added the default of UIMAGE_SOME_ADDRESS to
bootm_data_init_defaults. I think that it is a sensible default and it
was useful for adding the command.

Before I did that, in these two cases the value for os_entry was
initialized with 0. With setting it explicitly to 0 I wanted to make
sure that the behavior doesn't change.

But you are right: I added a check for that in bootm_boot later. I just
checked again: There is no case where the os_entry is used in between.
So these two should be not unnecessary.

I'll remove it in a v6 of the patch.

>> +int fit_get_image_address(struct fit_handle *handle, void *configuration,
>> +			  const char *name, const char *property,
>> +			  unsigned long *address)
>> +{
>> +	struct device_node *image;
>> +	const char *unit = name;
>> +	int ret;
>> +
>> +	if (!address || !property || !name)
>> +		return -EINVAL;
>> +
>> +	ret = fit_get_image(handle, configuration, &unit, &image);
>> +	if (ret)
>> +		return ret;
>> +
>> +	pr_info("%s/%s: ", image->full_name, property);
>> +
>> +	ret = fit_get_address(image, property, address);
>> +	if (ret < 0)
>> +		pr_cont("<not found>\n");
>> +	else
>> +		pr_cont("0x%lx\n", *address);
> 
> pr_cont() doesn't work well in barebox and should be avoided.

I wasn't aware of that. In one of the earlier versions of the patch it
was suggested to print that info. I'll find another solution or remove it.

> 
> Also I think this function shouldn't print anything, the caller should
> if it wishes to.

I had the impression that most of the functions print the information
themselves. For example fit_open_image prints a lot of information about
the image. fit_find_compatible_unit (which is used in
fit_open_configuration) prints that it found a matching unit.

It is a bit unclear when it would be OK for a function to print anything
and when not. But I can move the print to bootm_boot where the function
is called. Or would you prefer that it is removed completely? I'm not
sure whether bootm_boot prints that information later?

Best regards

Christian

> 
> Otherwise the patch looks fine to me.
> 
> Sascha
> 

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