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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.686, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=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: 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 5/16/25 04:59, Jamin Lin wrote: > Hi Cédric > >> >> On a BE host, if I run an ast2700a0-evb machine : >> >> $ qemu-system-aarch64 -machine ast2700a0-evb ... >> ... >> U-Boot 2023.10-v00.05.06 (Mar 26 2025 - 05:59:26 +0000) >> >> SOC: AST2700-A0 >> Model: AST2700 EVB >> DRAM: 8 GiB (effective 0 Bytes) >> >> QEMU hangs. >> >> If the RAM size is defined to 8g >> >> $ qemu-system-aarch64 -machine ast2700a0-evb -m 8g ... >> ... >> U-Boot 2023.10-v00.05.06 (Mar 26 2025 - 05:59:26 +0000) >> >> SOC: AST2700-A0 >> Model: AST2700 EVB >> DRAM: 8 GiB >> aspeed_dp dp@12c0a000: aspeed_dp_probe(): Failed to access dp. >> version(0) >> Core: 125 devices, 27 uclasses, devicetree: separate >> >> machine boots. >> >> Whereas, with an ast2700a1-evb machine : >> >> $ qemu-system-aarch64 -machine ast2700a1-evb ... >> ... >> U-Boot 2023.10-v00.05.06 (Mar 26 2025 - 05:59:26 +0000) >> >> SOC: AST2700-A1 >> Model: AST2700 EVB >> DRAM: 1 GiB >> aspeed_dp dp@12c0a000: aspeed_dp_probe(): Failed to access dp. >> version(0) >> Core: 125 devices, 27 uclasses, devicetree: separate >> >> machine boots. >> >> $ qemu-system-aarch64 -machine ast2700a1-evb -m 8g ... >> ... >> U-Boot 2023.10-v00.05.06 (Mar 26 2025 - 05:59:26 +0000) >> >> SOC: AST2700-A1 >> Model: AST2700 EVB >> DRAM: 8 GiB >> aspeed_dp dp@12c0a000: aspeed_dp_probe(): Failed to access dp. >> version(0) >> Core: 125 devices, 27 uclasses, devicetree: separate >> >> machine boots. >> >> >> I Wonder if you could analyze this issue to check if it is related to one of our >> QEMU model. >> >> > > Sorry, I only have a little-endian host machine (x86_64). > Is it possible to run a big-endian(POWER PC) QEMU host environment on this machine, so that I can then run the AST2700 QEMU target inside it to analyze this issue? You can but unless you have access to a POWER hypervisor, this will be very slow because of the 2 levels of emulations. > If you agree, could you please help me insert the following lines into the function that detects the DRAM size on the AST2700? > https://github.com/qemu/qemu/blob/master/hw/arm/aspeed_ast27x0.c#L332 > https://github.com/qemu/qemu/commit/7436db1063bbfecc2e498a7d795613b33312d665 > ```` > static void aspeed_ram_capacity_write(void *opaque, hwaddr addr, uint64_t data, > unsigned int size) > { > AspeedSoCState *s = ASPEED_SOC(opaque); > ram_addr_t ram_size; > MemTxResult result; > uint32_t read_back[4] = {0}; > ram_size = object_property_get_uint(OBJECT(&s->sdmc), "ram-size", > &error_abort); > > assert(ram_size > 0); > printf("jamin size %d\n", size); > printf("addr=%" PRIx64 " (addr ram_size)=%" PRIx64 "\n", addr, (addr % ram_size)); > /* > * Emulate ddr capacity hardware behavior. > * If writes the data to the address which is beyond the ram size, > * it would write the data to the "address % ram_size". > */ > result = address_space_write(&s->dram_as, addr % ram_size, > MEMTXATTRS_UNSPECIFIED, &data, size); > if (result != MEMTX_OK) { > qemu_log_mask(LOG_GUEST_ERROR, > "%s: DRAM write failed, addr:0x%" HWADDR_PRIx > ", data :0x%" PRIx64 "\n", > __func__, addr % ram_size, data); > } > > address_space_read(&s->dram_as, addr % ram_size, > MEMTXATTRS_UNSPECIFIED, read_back, > size); > > for(int i=0; i<4; i++) { > printf("jamin read_back[%d]=%x\n", i, read_back[i]); > } > } > ```` > Also, could you please provide me with the following log? > > U-Boot 2023.10-v00.05.06 (Mar 26 2025 - 05:59:26 +0000) > > SOC: AST2700-A0 > Model: AST2700 EVB > DRAM: jamin size 4 > addr=c0000000 (addr ram_size)=0 > jamin read_back[0]=eadbeef4 > jamin read_back[1]=0 > jamin read_back[2]=0 > jamin read_back[3]=0 > jamin size 4 > addr=40000000 (addr ram_size)=0 > jamin read_back[0]=adbeef43 > jamin read_back[1]=0 > jamin read_back[2]=0 > jamin read_back[3]=0 > jamin size 4 > addr=0 (addr ram_size)=0 > jamin read_back[0]=dbeef432 > jamin read_back[1]=0 > jamin read_back[2]=0 > jamin read_back[3]=0 > 1 GiB U-Boot 2023.10-v00.05.06 (Mar 26 2025 - 05:59:26 +0000) SOC: AST2700-A0 Model: AST2700 EVB DRAM: aspeed_sdmc_read reg @0x4 data: 0x28 aspeed_sdmc_read reg @0x4 data: 0x28 aspeed_sdmc_write reg @0x4 data: 0x34 jamin size 4 addr=c0000000 (addr ram_size)=0 jamin read_back[0]=0 <-- this is wrong jamin read_back[1]=0 jamin read_back[2]=0 jamin read_back[3]=0 aspeed_sdmc_read reg @0x4 data: 0x3c aspeed_sdmc_write reg @0x4 data: 0x34 aspeed_sdmc_read reg @0xc data: 0x0 aspeed_sdmc_write reg @0xc data: 0x1b8 aspeed_sdmc_read reg @0x40 data: 0x0 jamin size 4 addr=1bdea1f70 (addr ram_size)=3dea1f70 jamin read_back[0]=0 jamin read_back[1]=0 jamin read_back[2]=0 jamin read_back[3]=0 jamin size 4 addr=1bdea1f74 (addr ram_size)=3dea1f74 jamin read_back[0]=0 jamin read_back[1]=0 jamin read_back[2]=0 jamin read_back[3]=0 jamin size 4 > > It's quite strange, because you mentioned that the A1 version works, but the A0 version doesn't. > It seems detect the DRAM size failed in this loop, > https://github.com/AspeedTech-BMC/u-boot/blob/aspeed-master-v2023.10/drivers/ram/aspeed/sdram_ast2700.c#L1173 > struct ddr_capacity ram_size[] = { > {0x10000000, {208, 256}}, // 256MB > {0x20000000, {208, 416}}, // 512MB > {0x40000000, {208, 560}}, // 1GB > {0x80000000, {472, 880}}, // 2GB > {0x100000000, {656, 880}}, // 4GB > {0x200000000, {880, 880}}, // 8GB > }; > u32 test_pattern = 0xdeadbeef > > for (sz = SDRAM_SIZE_8GB - 1; sz > SDRAM_SIZE_256MB; sz--) { > test_pattern = (test_pattern << 4) + sz; > writel(test_pattern, (void *)CFG_SYS_SDRAM_BASE + ram_size[sz].size); > > if (readl((void *)CFG_SYS_SDRAM_BASE) != test_pattern) > break; > } > > Please help to dump this register. > => md 12c00010 > 12c00010: 00000028 00000000 00000000 00000000 (............... I can't do that because the u-boot prompt is never reached. From QEMU: (qemu) x/10x 0x12c00010 0000000012c00010: 0x0000003c 0x00000000 0x00000000 0x00000000 0000000012c00020: 0x00000000 0x00000000 0x00000000 0x00000000 0000000012c00030: 0x000001b8 0x00000000 Hope it helps C.