92a9978b44
[spi] Add address-length autodetection to the SPI bit-bashing code
Several SPI chips will respond to an SPI read command with a dummy
zero bit immediately prior to the first real data bit. This can be
used to autodetect the address length, provided that the command
length and data length are already known, and that the MISO data line
is tied high.
Tested-by: Thomas Miletich <thomas.miletich@gmail.com >
Debugged-by: Thomas Miletich <thomas.miletich@gmail.com >
15 lat temu
c44a193d0d
[legal] Add a selection of FILE_LICENCE declarations
Add FILE_LICENCE declarations to almost all files that make up the
various standard builds of gPXE.
15 lat temu
a1572e0ab0
Modify gPXE core and drivers to work with the new timer subsystem
Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com >
16 lat temu
1949641d10
Fix compiler warnings that appear only on OpenBSD.
17 lat temu
d2bf7abe75
Added write support for three-wire devices (e.g. the RTL8139 EEPROM)
18 lat temu
946967f09c
Abstracted out part of the concept of an SPI device to a generalised NVS
device.
Separated the mechanisms of non-volatile storage access and non-volatile
stored options.
18 lat temu
dc06c895fc
Changed length parameter in SPI methods to be a byte length, rather than
a word length.
18 lat temu
931f94dca3
Generalised the SPI abstraction layer to also be able to handle interfaces
that don't provide the full flexibility of a bit-bashing interface.
Temporarily hacked rtl8139.c to use the new interface.
18 lat temu
3b51c719d3
Generalise three-wire interface to generic SPI interface.
Update rtl8139 driver to instantiate an SPI interface with a three-wire
device attached.
18 lat temu
aa2468babe
Added abstraction layer for a three-wire serial device (e.g. the EEPROM
used on RTL8139 cards).
18 lat temu
Michael Brown