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Diffstat (limited to 'qemu/roms/u-boot/doc/SPI/README.ti_qspi_flash')
| -rw-r--r-- | qemu/roms/u-boot/doc/SPI/README.ti_qspi_flash | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/qemu/roms/u-boot/doc/SPI/README.ti_qspi_flash b/qemu/roms/u-boot/doc/SPI/README.ti_qspi_flash deleted file mode 100644 index 1b86d01a0..000000000 --- a/qemu/roms/u-boot/doc/SPI/README.ti_qspi_flash +++ /dev/null @@ -1,47 +0,0 @@ -QSPI U-boot support ------------------- - -Host processor is connected to serial flash device via qpsi -interface. QSPI is a kind of spi module that allows single, -dual and quad read access to external spi devices. The module -has a memory mapped interface which provide direct interface -for accessing data form external spi devices. - -The one QSPI in the device is primarily intended for fast booting -from Quad SPI flash devices. - -Usecase -------- - -MLO/u-boot.img will be flashed from SD/MMC to the flash device -using serial flash erase and write commands. Then, switch settings -will be changed to qspi boot. Then, the ROM code will read MLO -from the predefined location in the flash, where it was flashed and -execute it after storing it in SDRAM. Then, the MLO will read -u-boot.img from flash and execute it from SDRAM. - -SPI mode -------- -SPI mode uses mtd spi framework for transfer and reception of data. -Can be used in: -1. Normal mode: use single pin for transfers -2. Dual Mode: use two pins for transfers. -3. Quad mode: use four pin for transfer - -Memory mapped read mode ------------------------ -In this, SPI controller is configured using configuration port and then -controler is switched to memory mapped port for data read. - -Driver ------- -drivers/qspi/ti_qspi.c - - Newly created file which is responsible for configuring the - qspi controller and also for providing the low level api which - is responsible for transferring the datas from host controller - to flash device and vice versa. - -Testing -------- -A seperated file named README.dra_qspi_test has been created which gives all the -details about the commands required to test qspi at u-boot level. |