On Wed, Feb 18, 2026 at 03:18:37PM +0100, Michal Simek wrote: > > > On 2/18/26 15:12, Tom Rini wrote: > > On Wed, Feb 18, 2026 at 12:03:15PM +0530, Padmarao Begari wrote: > > > > > A 2 MB region of DDR memory is allocated for U‑Boot SPL, with the > > > heap starting at address 0x80000000 and the stack at 0x80200000. > > > However, U‑Boot fails when using OpenSBI v1.8 because OpenSBI begins > > > execution at 0x80100000, causing an overlap between the SPL stack > > > and the malloc region. > > > To resolve this conflict, the SPL heap and stack are moved to > > > higher memory addresses, and OpenSBI is relocated to 0x80000000. > > > The SPL heap now starts at 0x8C000000, and the stack is placed > > > at 0x8F000000. The MB-V requires at least 256MB of DDR to run U-Boot. > > > > > > _________________ > > > | |0x8FFFFFFF > > > |_______________| > > > | SPL- Stack |0x8F000000 > > > | | > > > | | > > > | SPL - Heap | > > > |_______________|0x8C000000 > > > | | > > > | | > > > | Full U-Boot | > > > |_______________|0x81200000 > > > |Load FIT Image | > > > |_______________|0x80200000 > > > | OpenSBI | > > > |_______________|0x80000000 > > > > > > Signed-off-by: Padmarao Begari <[email protected]> > > > --- > > > configs/xilinx_mbv32_defconfig | 4 ++-- > > > configs/xilinx_mbv32_smode_defconfig | 2 +- > > > configs/xilinx_mbv64_smode_defconfig | 2 +- > > > 3 files changed, 4 insertions(+), 4 deletions(-) > > > > As general feedback, this is something that ought to be in doc/board/ > > somewhere too. One such existing example is doc/board/ti/am62x_sk.rst > > and follow-up patches are fine. > > Just curious. Memory layout is something what every platform has to deal with. > Don't we have any script for it?
My still current preference is putting reasonable default values in Kconfig, so that it's not something that has to be managed in defconfigs as it's not typically on the developer to modify per board, but rather on whomever is doing the upstream SoC/etc support to say what it is. But that's also a little less true for FPGA platforms? -- Tom
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