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| author | Timur Tabi <timur@codeaurora.org> | 2016-01-04 15:37:42 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-06 21:02:45 -0800 |
| commit | 3b78fae793c027140cfe635ef216bf60aa6498f4 (patch) | |
| tree | 3b0157674a758482d9f3c773f3bdcb78990a9774 /Documentation/kernel-parameters.txt | |
| parent | cdf091ca2c3d6875e5f0fca28de4a6ca2f5273e6 (diff) | |
| download | lwn-3b78fae793c027140cfe635ef216bf60aa6498f4.tar.gz lwn-3b78fae793c027140cfe635ef216bf60aa6498f4.zip | |
tty: amba-pl011: use iotype instead of access_32b to track 32-bit I/O
Instead of defining a new field in the uart_amba_port structure, use the
existing iotype field of the uart_port structure, which is intended for
this purpose. If we need to use 32-bit register access, we set iotype
to UPIO_MEM32, otherwise we set it to UPIO_MEM.
For early console, specify the "mmio32" option on the kernel command-line.
Example:
earlycon=pl011,mmio32,0x3ced1000
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 054e11d33b6b..654c547b9fc9 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1003,10 +1003,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. unspecified, the h/w is not initialized. pl011,<addr> + pl011,mmio32,<addr> Start an early, polled-mode console on a pl011 serial port at the specified address. The pl011 serial port must already be setup and configured. Options are not - yet supported. + yet supported. If 'mmio32' is specified, then only + the driver will use only 32-bit accessors to read/write + the device registers. msm_serial,<addr> Start an early, polled-mode console on an msm serial |