[SUBMIT] tlv_eeprom: fix bug when decoding TLV string of decimal numbers

This bug is not present in U-Boot, but happens if you compile the TLV code base
with glibc.

For default or TLV_CODE_VENDOR_EXT types, the decoded value as a string is
incorrect and display only the last byte.

For example, if TLV contains type TLV_CODE_VENDOR_EXT with a length of 6,
and bytes "0x66 0x6F 0x6F 0x62 0x61 0x72", here is the decoded output:

    TLV Name             Code Len Value
    -------------------- ---- --- -----
    Vendor Extension     0xFD   6  0x72

The reason (also identified by GCC warning message below) is that the behavior
of glibc sprintf is undefined if copying takes place between objects that
overlap - for example, if s is also given as an argument to be printed under
control of the ‘%s’ conversion.

Fix by using strcat and sprintf with an intermediate variable.

This also has the nice benefit of fixing this warning:

    In function ‘sprintf’,
    inlined from ‘decode_tlv_value’ at tlv_eeprom.c:343:4:
    ...stdio2.h:30:10: warning: ‘__builtin___sprintf_chk’ argument 5 overlaps destination object ‘value’ [-Wrestrict]
    30 |   return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ...

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

[SUBMIT] tlv_eeprom: avoid code duplication in decode_tlv()

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: add tlvinfo_show_tlv()

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: add decode_tlv_value()

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: add is_valid_tlvinfo()

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: do not start over with default contents if invalid

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: delete old key before updating if it already exists

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: make sure key exist when deleting it

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: suppress -Wstringop-truncation warning for false positive

Suppress this warning:

tlv_eeprom.c:490:17: warning: ‘__builtin_strncpy’ specified bound 256 equals destination size [-Wstringop-truncation]
  490 |                 strncpy(data, strval, MAX_TLV_VALUE_LEN);
      |                 ^

Data is a fixed-length buffer, and no terminating null character is required,
thus this warning is a false positive.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv-eeprom: adapt for integration with hvtlv

Replace calls to i2c_eeprom_read/write and call eeprom_block_read/write
from main.c.

Use zlib crc32 function.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: suppress success log messages

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: convert local functions to public scope

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: remove U-Boot specific code

tlv_eeprom: fix comparison of integer expressions of different signedness

Fixes the following warnings:

tlv_eeprom.c:246:23: warning: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Wsign-compare]
  246 |         for (i = 0; i < ARRAY_SIZE(tlv_code_list); i++) {
      |                       ^

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

tlv_eeprom: import code from U-Boot v2026.01-rc1

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Add kernel/U-Boot compatibility header file

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Remove include of <linux/printk.h> in kernel.h

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Import kernel.h from U-Boot

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Add Yocto recipe

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

options: redefine help to replace -? with -h

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Initial import

Setup autotools project.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>