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ARM: 8804/1: zImage: atags_to_fdt: add serial-number for ATAG_SERIAL

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If the system passes an ATAG_SERIAL, convert that into a /serial-number
node so that the system serial number will be passed through the FDT and
be present under the kernel.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Ben Dooks 2018-10-12 09:12:01 +01:00 committed by Russell King
parent 7f97686715
commit 31d0b9f998
1 changed files with 23 additions and 0 deletions
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23
arch/arm/boot/compressed/atags_to_fdt.c
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@ -98,6 +98,24 @@ static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline)
setprop_string(fdt, "/chosen", "bootargs", cmdline);
}
static void hex_str(char *out, uint32_t value)
{
uint32_t digit;
int idx;
for (idx = 7; idx >= 0; idx--) {
digit = value >> 28;
value <<= 4;
digit &= 0xf;
if (digit < 10)
digit += '0';
else
digit += 'A'-10;
*out++ = digit;
}
*out = '\0';
}
/*
* Convert and fold provided ATAGs into the provided FDT.
*
@ -180,6 +198,11 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space)
initrd_start);
setprop_cell(fdt, "/chosen", "linux,initrd-end",
initrd_start + initrd_size);
} else if (atag->hdr.tag == ATAG_SERIAL) {
char serno[16+2];
hex_str(serno, atag->u.serialnr.high);
hex_str(serno+8, atag->u.serialnr.low);
setprop_string(fdt, "/", "serial-number", serno);
}
}