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| author | Jason Liu <r64343@freescale.com> | 2010-05-14 16:08:22 +0800 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2010-05-14 17:09:22 +0800 |
| commit | a0e1ec967f99d08ce0a48c45a509959453e5f3a7 (patch) | |
| tree | edfa600011bbe5dd9218d883e5c9f6685b0c718b /common/cmd_setexpr.c | |
| parent | 9ef0863e8bd5eba9243b4f5e84b75806b1d4c889 (diff) | |
| download | u-boot-imx-a0e1ec967f99d08ce0a48c45a509959453e5f3a7.zip u-boot-imx-a0e1ec967f99d08ce0a48c45a509959453e5f3a7.tar.gz u-boot-imx-a0e1ec967f99d08ce0a48c45a509959453e5f3a7.tar.bz2 | |
ENGR00123488 MX53 Board Identification
The CPU_ID0 analog voltage level is obtained by reading ADC
channel 12 of the LTC2495 and the CPU_ID1 analog voltage
level is obtained by reading ADC channel 13.
The ADC data register value read from the LTC2495 is a 24 bit value.
For example, an ADC value that reads between 0xB3CF3E and 0xB9E79E
indicates a 130k ohm resistor is populated on the daughtercard,
which corresponds to ID level 20
By using CPU_ID0, CPU_ID1 to identify the board for example:
CPU_ID0 = 21, CPU_ID1 = 15, MX53-EVK with DDR2 1GByte RevB
Signed-off-by:Jason Liu <r64343@freescale.com>
Diffstat (limited to 'common/cmd_setexpr.c')
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