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envelope-from=chao.liu@processmission.com; helo=SEYPR02CU001.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Jul 23, 2026 at 11:18:29PM +0800, Bin Meng wrote: > HSS uses a window at 0x0a000000 while setting up the L2 cache, > decompressing its runtime image, and executing that image. > The missing mapping causes the E51 to trap before firmware can > initialize its UART. > > Represent the window with RAM to provide its persistent read, > write, and execute effects without claiming to model the L2 > cache itself. > > Signed-off-by: Bin Meng Reviewed-by: Chao Liu Thanks, Chao > --- > > include/hw/riscv/microchip_pfsoc.h | 1 + > hw/riscv/microchip_pfsoc.c | 13 +++++++++++++ > 2 files changed, 14 insertions(+) > > diff --git a/include/hw/riscv/microchip_pfsoc.h b/include/hw/riscv/microchip_pfsoc.h > index a30b944afa..612fd2b69c 100644 > --- a/include/hw/riscv/microchip_pfsoc.h > +++ b/include/hw/riscv/microchip_pfsoc.h > @@ -90,6 +90,7 @@ enum { > MICROCHIP_PFSOC_L2CC, > MICROCHIP_PFSOC_DMA, > MICROCHIP_PFSOC_L2LIM, > + MICROCHIP_PFSOC_L2ZERO, > MICROCHIP_PFSOC_PLIC, > MICROCHIP_PFSOC_MMUART0, > MICROCHIP_PFSOC_WDOG0, > diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c > index 218cccab69..fd28ee75fe 100644 > --- a/hw/riscv/microchip_pfsoc.c > +++ b/hw/riscv/microchip_pfsoc.c > @@ -97,6 +97,7 @@ static const MemMapEntry microchip_pfsoc_memmap[] = { > [MICROCHIP_PFSOC_L2CC] = { 0x2010000, 0x1000 }, > [MICROCHIP_PFSOC_DMA] = { 0x3000000, 0x100000 }, > [MICROCHIP_PFSOC_L2LIM] = { 0x8000000, 0x200000 }, > + [MICROCHIP_PFSOC_L2ZERO] = { 0xa000000, 0x200000 }, > [MICROCHIP_PFSOC_PLIC] = { 0xc000000, 0x4000000 }, > [MICROCHIP_PFSOC_MMUART0] = { 0x20000000, 0x1000 }, > [MICROCHIP_PFSOC_WDOG0] = { 0x20001000, 0x1000 }, > @@ -201,6 +202,7 @@ static void microchip_pfsoc_soc_realize(DeviceState *dev, Error **errp) > MemoryRegion *rsvd0_mem = g_new(MemoryRegion, 1); > MemoryRegion *e51_dtim_mem = g_new(MemoryRegion, 1); > MemoryRegion *l2lim_mem = g_new(MemoryRegion, 1); > + MemoryRegion *l2zero_mem = g_new(MemoryRegion, 1); > MemoryRegion *envm_data = g_new(MemoryRegion, 1); > MemoryRegion *qspi_xip_mem = g_new(MemoryRegion, 1); > char *plic_hart_config; > @@ -277,6 +279,17 @@ static void microchip_pfsoc_soc_realize(DeviceState *dev, Error **errp) > memmap[MICROCHIP_PFSOC_L2LIM].base, > l2lim_mem); > > + /* > + * HSS decompresses into the L2 zero-device window and executes there. > + * Model it as RAM because QEMU does not model the backing L2 cache. > + */ > + memory_region_init_ram(l2zero_mem, NULL, "microchip.pfsoc.l2zero", > + memmap[MICROCHIP_PFSOC_L2ZERO].size, > + &error_fatal); > + memory_region_add_subregion(system_memory, > + memmap[MICROCHIP_PFSOC_L2ZERO].base, > + l2zero_mem); > + > /* create PLIC hart topology configuration string */ > plic_hart_config = riscv_plic_hart_config_string(ms->smp.cpus); > > -- > 2.34.1 >