On 09/21/2014 11:17 PM, Wang Huan-B18965 wrote: > > [Alison Wang] Let me explain the sequence. > > 1. u-boot-spl.bin is produced. The size of it is not a fixed value. > > 2. u-boot-spl-pbl-pad.bin is produced. The size of it is defined by > CONFIG_SPL_MAX_SIZE. For detail, u-boot-spl-pbl-pad.bin is generated > by padding u-boot-spl.bin to the size of CONFIG_SPL_MAX_SIZE. > > The following is the reason for using u-boot-spl-pbl-pad.bin. > > First of all, the SPL part need to be reorganized for the recognition > of PBL through the pblimage tool. > > For the pblimage tool, the SPL image is splitted into 64 byte chunks, > and PBL needs a command for each piece. In current pblimage tool, > the size of the SPL image(u-boot-spl.bin) should be a fixed value > like PowerPC. Well, for LS102xA and some other ARM platforms, the size > of the SPL image (u-boot-spl.bin) is changeable. So a new image > spl/u-boot-spl-pbl-pad.bin is produced, and the size of it is a fixed > value "CONFIG_SPL_MAX_SIZE". Then use u-boot-spl-pbl-pad.bin instead > of spl/u-boot-spl.bin to generate spl/u-boot-spl.pbl. > > 3. spl/u-boot-spl.pbl is produced through pblimage tool. As > CONFIG_SPL_PBL_PAD is enabled, spl/u-boot-spl-pbl-pad.bin is used as > the source file instead of spl/u-boot-spl.bin. > > 4. u-boot-with-spl-pbl.bin is produced. For detail, u-boot-with-spl-pbl.bin > is generated by padding spl/u-boot-spl.pbl to the offset of CONFIG_SPL_PAD_TO > and adding u-boot.img. > > As the size of spl/u-boot-spl.pbl is not a fixed value, we pad it to > the offset of CONFIG_SPL_PAD_TO. So it is convenient for us to determine > the location of u-boot.img in SD card. >
Sorry for the late respond. I was away for an urgent project. If I understand you correctly, you define a CONFIG_SPL_MAX_SIZE and pad the final binary file to this size. How do you determine the size? I understand PBL loading mechanism. Would it be possible to pad to 64 byte boundary (or any practical size since it is adjustable) and avoid the definition of CONFIG_SPL_MAX_SIZE? York _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot