barebox PBL question
w.egorov at phytec.de
Mon Feb 13 07:13:48 PST 2017
I would like to add SPL support for the RK3288 SoC to barebox. But I am
a few problems.
The maximum size of the SPL image which the ROM code will read is 32KB.
I was thinking to use the PBL feature for the SPL part. But using the
the pbl code (with decompression) seems to be not a good idea, because
is already about 30K. I think this is an overhead.
But now I wonder how to generate two different images with a single build.
A SPL image, which should not exceed 32K and a barebox.
I have problems to fully understand the PBL mechanism.
Why are the builds always adding the barebox.bin images to the PBL part?
Here is an example, cat .zbarebox.cmd
ld -EL -Map arch/arm/pbl/zbarebox.map --gc-sections -static -o
arch/arm/pbl/zbarebox -e pbl_start -T arch/arm/pbl/zbarebox.lds
--start-group common/built-in-pbl.o [...] arch/arm/pbl/piggy.shipped.o
piggy.shipped.o is barebox.bin, which is added in piggy.shipped.S:
So my question is, how do I generate a seperate PBL image without the
My SPL code for RK3288 should just init the SDRAM an then jump back to
ROM code to load the barebox.
More information about the barebox