[PATCH v2 0/2] common/memsize.c: Fix get_ram_size() when cache is enabled

Francesco Dolcini francesco at dolcini.it
Tue May 30 15:33:25 CEST 2023

From: Francesco Dolcini <francesco.dolcini at toradex.com>

Ensure that every write is flushed to memory and afterward reads are
from memory.
Since the algorithm rely on the fact that accessing to not existent
memory lead to write at addr / 2 without this modification accesses
to aliased (not physically present) addresses are cached and
wrong size is returned.

This was discovered while working on a TI AM625 based board
where cache is normally enabled, see commit c02712a74849 ("arm: mach-k3: Enable dcache in SPL").

Test results here: https://github.com/u-boot/u-boot/pull/293

 * added additional patch to fix sandbox build
 * ensure that the changes are fine with every arch/build,
   check if cache is enabled and check for cache line size define

Emanuele Ghidoli (2):
  sandbox: Add a dummy dcache_status() function
  common/memsize.c: Fix get_ram_size() when cache is enabled

 arch/sandbox/cpu/cpu.c |  5 +++++
 common/memsize.c       | 24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+)


More information about the U-Boot mailing list