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rockchip: misc: protect serial# from getting overwritten 

serial# is one of the vendor properties and thus protected from being
overwritten if already set. If env_set is called anyway this result in
some nasty warnings, so check for presence before trying that.

In the same direction check for the presence of cpuid# and compare it
to the actual hardware and emit a warning if they don't match.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Heiko Stuebner 2019-11-29 16:40:43 +01:00 committed by Kever Yang
parent d490fadc70
commit fd3a7ae8e6
1 changed files with 10 additions and 1 deletions
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11
arch/arm/mach-rockchip/misc.c
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@ -92,6 +92,7 @@ int rockchip_cpuid_set(const u8 *cpuid, const u32 cpuid_length)
char cpuid_str[cpuid_length * 2 + 1];
u64 serialno;
char serialno_str[17];
const char *oldid;
int i;
memset(cpuid_str, 0, sizeof(cpuid_str));
@ -113,8 +114,16 @@ int rockchip_cpuid_set(const u8 *cpuid, const u32 cpuid_length)
serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
snprintf(serialno_str, sizeof(serialno_str), "%016llx", serialno);
oldid = env_get("cpuid#");
if (oldid && strcmp(oldid, cpuid_str) != 0)
printf("cpuid: value %s present in env does not match hardware %s\n",
oldid, cpuid_str);
env_set("cpuid#", cpuid_str);
env_set("serial#", serialno_str);
/* Only generate serial# when none is set yet */
if (!env_get("serial#"))
env_set("serial#", serialno_str);
return 0;
}