Add a new 'sf mmap' function to show the address of a SPI offset, if the hardware supports it. This is useful on x86 systems.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v3: - Add configuration and return value also
arch/Kconfig | 2 ++ cmd/Kconfig | 8 ++++++ cmd/sf.c | 35 +++++++++++++++++++++++++++ doc/usage/sf.rst | 63 ++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 108 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig index b6f9e177b64..0c718535279 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -136,6 +136,7 @@ config SANDBOX imply CMD_LZMADEC imply CMD_SATA imply CMD_SF + imply CMD_SF_MMAP imply CMD_SF_TEST imply CRC32_VERIFY imply FAT_WRITE @@ -201,6 +202,7 @@ config X86 imply CMD_IRQ imply CMD_PCI imply CMD_SF + imply CMD_SF_MMAP imply CMD_SF_TEST imply CMD_ZBOOT imply DM_ETH diff --git a/cmd/Kconfig b/cmd/Kconfig index ffef3cc76ca..e96b6e798bb 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1273,6 +1273,14 @@ config CMD_SF help SPI Flash support
+config CMD_SF_MMAP + bool "sf mmap - Access memory-mapped SPI flash" + depends on CMD_SF + help + On some systems part of the SPI flash is mapped into mmemory. This + command provides a way to map a SPI-flash offset to a memory address, + so that the contents can be browsed using 'md', for example. + config CMD_SF_TEST bool "sf test - Allow testing of SPI flash" depends on CMD_SF diff --git a/cmd/sf.c b/cmd/sf.c index d4f5ecee38c..28b480acc58 100644 --- a/cmd/sf.c +++ b/cmd/sf.c @@ -384,6 +384,36 @@ static int do_spi_protect(int argc, char *const argv[]) return ret == 0 ? 0 : 1; }
+static int do_spi_flash_mmap(int argc, char *const argv[]) +{ + loff_t offset, len, maxsize; + uint map_offset, map_size; + ulong map_base; + int dev = 0; + int ret; + + if (argc < 2) + return CMD_RET_USAGE; + + ret = mtd_arg_off_size(argc - 1, &argv[1], &dev, &offset, &len, + &maxsize, MTD_DEV_TYPE_NOR, flash->size); + if (ret) + return ret; + + ret = dm_spi_get_mmap(flash->dev, &map_base, &map_size, &map_offset); + if (ret) { + printf("Mapping not available (err=%d)\n", ret); + return CMD_RET_FAILURE; + } + if (offset < 0 || offset + len > map_size) { + printf("Offset out of range (map size %x)\n", map_size); + return CMD_RET_FAILURE; + } + printf("%lx\n", map_base + (ulong)offset); + + return 0; +} + enum { STAGE_ERASE, STAGE_CHECK, @@ -580,6 +610,8 @@ static int do_spi_flash(struct cmd_tbl *cmdtp, int flag, int argc, ret = do_spi_flash_erase(argc, argv); else if (strcmp(cmd, "protect") == 0) ret = do_spi_protect(argc, argv); + else if (IS_ENABLED(CONFIG_CMD_SF_MMAP) && !strcmp(cmd, "mmap")) + ret = do_spi_flash_mmap(argc, argv); else if (IS_ENABLED(CONFIG_CMD_SF_TEST) && !strcmp(cmd, "test")) ret = do_spi_flash_test(argc, argv); else @@ -611,6 +643,9 @@ static const char long_help[] = " or to start of mtd `partition'\n" "sf protect lock/unlock sector len - protect/unprotect 'len' bytes starting\n" " at address 'sector'" +#ifdef CONFIG_CMD_SF_MMAP + "\nsf mmap offset len - get memory address of SPI-flash offset\n" +#endif #ifdef CONFIG_CMD_SF_TEST "\nsf test offset len - run a very basic destructive test" #endif diff --git a/doc/usage/sf.rst b/doc/usage/sf.rst index 6ace1b428d9..b89c0fd5b01 100644 --- a/doc/usage/sf.rst +++ b/doc/usage/sf.rst @@ -14,6 +14,7 @@ Synopis sf erase <offset>|<partition> <len> sf update <addr> <offset>|<partition> <len> sf protect lock|unlock <sector> <len> + sf mmap <offset>|<partition> <len> sf test <offset>|<partition> <len>
Description @@ -143,6 +144,16 @@ lock|unlock Number of bytes to lock/unlock
+Memory-mapped flash +------------------- + +On some systems part of the SPI flash is mapped into mmemory. With *sf mmap* +you can map a SPI-flash offset to a memory address, so that the contents can be +browsed using 'md', for example. + +The command will fail if this is not supported by the hardware or driver. + + Test ~~~~
@@ -236,6 +247,58 @@ This second example is running on coral, an x86 Chromebook:: 2 write: 227 ticks, 2255 KiB/s 18.040 Mbps 3 read: 189 ticks, 2708 KiB/s 21.664 Mbps
+ # On coral, SPI flash offset 0 corresponds to address ff081000 in memory + => sf mmap 0 1000 + device 0 offset 0x0, size 0x1000 + ff081000 + + # See below for how this address was obtained + => sf mmap e80000 11e18 + device 0 offset 0xe80000, size 0x11e18 + fff01000 + => md fff01000 + fff01000: b2e8e089 89000030 30b4e8c4 c0310000 ....0......0..1. + fff01010: 002c95e8 2ce8e800 feeb0000 dfe8c489 ..,....,........ + fff01020: f400002c 83f4fdeb d4e80cec 3100001e ,..............1 + fff01030: 0cc483c0 f883c3c3 8b0b770a df408504 .........w....@. + fff01040: c085fef1 c8b80575 c3fef1e5 53565755 ....u.......UWVS + fff01050: 89c38951 2404c7c5 80000002 8924048b Q......$......$. + fff01060: 89a20fdf 89fb89de 75890045 084d8904 ........E..u..M. + fff01070: ff0c5589 c5832404 243c8110 80000005 .U...$....<$.... + fff01080: 43c6da75 3b800030 43037520 d889f8eb u..C0..; u.C.... + fff01090: 5f5e5b5a 80e6c35d 535657c3 e7e8c689 Z[^_]....WVS.... + fff010a0: 89000069 00a164c3 8b000000 408b4c56 i....d......VL.@ + fff010b0: 0cec837c ddb9ff6a e8fef1e5 00004e01 |...j........N.. + fff010c0: a1640389 00000000 1c80b60f 66000001 ..d............f + fff010d0: b80c4389 00000001 a20fdf89 fb89de89 .C.............. + fff010e0: 89104389 c4831453 5bc03110 56c35f5e .C..S....1.[^_.V + fff010f0: 14ec8353 ce89d389 0000a164 b60f0000 S.......d....... + + +The offset e80000 was obtained using the following binman command, to find the +location of U-Boot SPL:: + + $ binman ls -i /tmp/b/chromebook_coral/u-boot.rom + Name Image-pos Size Entry-type Offset Uncomp-size + ------------------------------------------------------------------------------------------------------ + main-section 0 1000000 section 0 + spl e80000 11e18 u-boot-spl ffe80000 + u-boot d00000 9106e u-boot ffd00000 + ... +
.. _SPI documentation: https://en.wikipedia.org/wiki/Serial_Peripheral_Interface + + +Configuration +------------- + +The *sf* command is only available if `CONFIG_CMD_SF=y`. Note that it depends on +`CONFIG_DM_SPI_FLASH`. + +Return value +------------ + +The return value $? is set to 0 (true) if the command succeded and to 1 (false) +otherwise.