Instead of sprinkling custom code and calls over the Vexpress64 boardfile, create a command that loads images using semihosting just like we would load from flash memory of over the network, using a special command:
smhload <image> <address>
This will make it possible to remove some custom calls and code and make the boot easier.
Signed-off-by: Linus Walleij linus.walleij@linaro.org --- arch/arm/lib/semihosting.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++ doc/README.semihosting | 25 ++++------------- 2 files changed, 75 insertions(+), 20 deletions(-)
diff --git a/arch/arm/lib/semihosting.c b/arch/arm/lib/semihosting.c index d3f724b726e1..edacb1187731 100644 --- a/arch/arm/lib/semihosting.c +++ b/arch/arm/lib/semihosting.c @@ -13,6 +13,7 @@ * for them. */ #include <common.h> +#include <command.h> #include <asm/semihosting.h>
#define SYSOPEN 0x01 @@ -234,3 +235,72 @@ long smh_len(const char *fname) /* Return the file length (or -1 error indication) */ return len; } + +static int smh_load_file(const char * const name, ulong load_addr, + ulong *end_addr) +{ + long fd; + long len; + long ret; + + fd = smh_open(name, "rb"); + if (fd == -1) + return -1; + + len = smh_len_fd(fd); + if (len < 0) { + smh_close(fd); + return -1; + } + + ret = smh_read(fd, (void *)load_addr, len); + smh_close(fd); + + if (ret == 0) { + *end_addr = load_addr + len - 1; + printf("loaded file %s from %08lX to %08lX, %08lX bytes\n", + name, + load_addr, + *end_addr, + len); + } else { + printf("read failed\n"); + return 0; + } + + return 0; +} + +static int do_smhload(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + if (argc == 3 || argc == 4) { + ulong load_addr; + ulong end_addr = 0; + ulong ret; + char end_str[64]; + + load_addr = simple_strtoul(argv[2], NULL, 16); + if (!load_addr) + return -1; + + ret = smh_load_file(argv[1], load_addr, &end_addr); + if (ret < 0) + return 1; + + /* Optionally save returned end to the environment */ + if (argc == 4) { + sprintf(end_str, "0x%08lx", end_addr); + setenv(argv[3], end_str); + } + } else { + return CMD_RET_USAGE; + } + return 0; +} + +U_BOOT_CMD(smhload, 4, 0, do_smhload, "load a file using semihosting", + "<file> 0x<address> [end var]\n" + " - load a semihosted file to the address specified\n" + " if the optional [end var] is specified, the end\n" + " address of the file will be stored in this environment\n" + " variable.\n"); diff --git a/doc/README.semihosting b/doc/README.semihosting index 724856078069..c016a4f8406d 100644 --- a/doc/README.semihosting +++ b/doc/README.semihosting @@ -30,25 +30,10 @@ vexpress_aemv8a.h but differentiate the two models by the presence or absence of CONFIG_BASE_FVP. This change is tested and works on both the Foundation and Base fastmodel simulators.
-The level of semihosting support is minimal, restricted to just what it -takes to load images to memory. If more semihosting functionality is -required, such as file seek, outputting strings, reading characters, etc, -then it can be easily added later. +The semihosting code adds a command:
-We require that the board include file define these env variables: -- kernel_name e.g. "uImage" -- kernel_addr_r e.g. "0x80000000" -- initrd_name e.g. "ramdisk.img" -- initrd_addr_r e.g. "0x88000000" -- fdt_name e.g. "devtree.dtb" -- fdt_addr_r e.g. "0x83000000" + smhload <image> <address> [env var]
-Optionally, "fdt_high" and "initrd_high" can be specified as per -their rules for allowing or preventing copying of these images. - -For the "fdt chosen" startup macro, this code will then define: -- initrd_end (based on retrieving initrd_addr_r plus actual initrd_size) - -We will then load the kernel, initrd, and fdt into the specified -locations in memory in a similar way that the ATF fastmodel code -uses semihosting calls to load other boot stages and u-boot itself. +That will load an image from the host filesystem into RAM at the specified +address and optionally store the load end address in the specified +environment variable.