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Ip=[198.47.23.194]; Helo=[lewvzet200.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: DM2PEPF00003FC7.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN0PR10MB5048 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean On Tue May 12, 2026 at 4:33 PM IST, Anshul Dalal wrote: > Currently the sequence to enable caches for the A53/A72 core on K3 > devices looks as follows: > > 1. Map entire DDR banks > 2. Setup page tables and enable MMU (done by mmu_setup) > 3. Unmap reserved-memory regions > 4. Enable caches > > However there is a brief period of execution between #2 and #3 where the > core can issue speculative accesses to the entire DDR space (including > the reserved-memory regions) despite the caches being disabled. > > A firewall exception is triggered whenever such speculative access is > made to secure DDR region of TFA or OP-TEE. This patch fixes the issue > by re-ordering the sequence as follows: > > 1. Map entire DDR banks > 2. Setup page tables > 3. Unmap reserved-memory regions > 4. Enable MMU > 5. Enable caches > > Fixes: f1c694b8fdde ("mach-k3: map all banks using mem_map_from_dram_bank= s") > Signed-off-by: Anshul Dalal Forgot to add: Reported-by: Suhaas Joshi -- Anshul Dalal