This patch adds a little tool that takes a generic MAC address and generates a CRC byte for it. The output is the full MAC address without any separators, ready written into an EEPROM.
Signed-off-by: Olliver Schinagl <[email protected]> --- tools/.gitignore | 1 + tools/Makefile | 4 ++++ tools/gen_ethaddr_crc.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 57 insertions(+) create mode 100644 tools/gen_ethaddr_crc.c diff --git a/tools/.gitignore b/tools/.gitignore index cb1e722..0d1f076 100644 --- a/tools/.gitignore +++ b/tools/.gitignore @@ -6,6 +6,7 @@ /fit_check_sign /fit_info /gen_eth_addr +/gen_ethaddr_crc /ifdtool /img2srec /kwboot diff --git a/tools/Makefile b/tools/Makefile index 06afdb0..4879ded 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -43,6 +43,10 @@ envcrc-objs := envcrc.o lib/crc32.o common/env_embedded.o lib/sha1.o hostprogs-$(CONFIG_CMD_NET) += gen_eth_addr HOSTCFLAGS_gen_eth_addr.o := -pedantic +hostprogs-$(CONFIG_CMD_NET) += gen_ethaddr_crc +gen_ethaddr_crc-objs := gen_ethaddr_crc.o lib/crc8.o +HOSTCFLAGS_gen_ethaddr_crc.o := -pedantic + hostprogs-$(CONFIG_CMD_LOADS) += img2srec HOSTCFLAGS_img2srec.o := -pedantic diff --git a/tools/gen_ethaddr_crc.c b/tools/gen_ethaddr_crc.c new file mode 100644 index 0000000..9b5bdb0 --- /dev/null +++ b/tools/gen_ethaddr_crc.c @@ -0,0 +1,52 @@ +/* + * (C) Copyright 2016 + * Olliver Schinagl <[email protected]> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <ctype.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <u-boot/crc.h> + +#define ARP_HLEN 6 /* Length of hardware address */ + +int main(int argc, char *argv[]) +{ + uint_fast8_t i; + uint8_t mac_addr[ARP_HLEN + 1] = { 0x00 }; + + if (argc < 2) { + puts("Please supply a MAC address."); + return -1; + } + + if (!((strlen(argv[1]) == 12) || (strlen(argv[1]) == 17))) { + puts("Please supply a valid MAC address with optionaly\n" + "dashes (-) or colons (:) as seperators."); + return -1; + } + + i = 0; + while (*argv[1] != '\0') { + char nibble[2] = { 0x00, '\n' }; /* for strtol */ + + nibble[0] = *argv[1]++; + if (isxdigit(nibble[0])) { + if (isupper(nibble[0])) + nibble[0] = tolower(nibble[0]); + mac_addr[i >> 1] |= strtol(nibble, NULL, 16) << ((i % 2) ? 0 : 4) & ((i % 2) ? 0x0f : 0xf0); + i++; + } + } + mac_addr[ARP_HLEN] = crc8(0, mac_addr, ARP_HLEN); + + for (i = 0; i < ARP_HLEN + 1; i++) + printf("%.2x", mac_addr[i]); + putchar('\n'); + + return 0; +} -- 2.10.2 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
