On Fri, Feb 06, 2026 at 07:02:07PM -0500, Greg Malysa wrote: > Hi Tom, > > On Thu, Feb 5, 2026 at 6:42 PM Tom Rini <[email protected]> wrote: > > > > Which means second, 64bit ARM platforms. With the exception of: > > socfpga_agilex7m socfpga_n5x_atf socfpga_n5x_vab socfpga_stratix10_atf > > all ARM64 SPL_FRAMEWORK using platforms use the > > arch/arm/cpu/armv8/u-boot-spl.lds explicitly. These other ones set > > CONFIG_SPL_LDSCRIPT to a non-existant file and then fall back to using > > arch/arm/cpu/armv8/u-boot-spl.lds. There are only 4 platforms which > > don't use a separate BSS section and so could trip up the above as well: > > r8a779g0_whitehawk r8a779g3_sparrowhawk sc598-som-ezkit-spl > > sc598-som-ezlite-spl > > I have inspected the Renesas platforms manually, and I'm a little unsure > > how this case works on the two sc598 platforms. > > Do you recommend using SPL_SEPARATE_BSS on our platform? After power > on, the sc598 has 2 MB of SRAM available starting at 0x20000000 which > we treat as just a single block of memory to use for all of SPL > operation, so we don't have any requirement to do something like a > bare bones DDR initialization before using it as our main memory for > SPL, so it didn't seem necessary to enable. The boot ROM has some > guidelines on where it will place its stack, so we restrict SPL to the > first 192 KB currently but this can easily be expanded. I'm not sure > if I should admit to it, but some decisions on Kconfigs were made 4 > years ago as an arbitrary choice during our initial bringup and then > were not reviewed because things were working. > > Either way, works for me on the sc598 + ezkit. There's no reason for > it to fail on the ezlite in that case either.
So SPL_SEPARATE_BSS is for when the BSS can be easily put in SDRAM instead. It's not better or worse than SRAM, it just depends on the system constraints. I only called these two platforms out because I don't actually see where the dtb comes from and so couldn't check the alignment and location matched. -- Tom
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