u-boot/doc/device-tree-bindings/ram/st,stm32-fmc.txt
Patrice Chotard f303aaf21b ram: stm32: add second SDRAM bank management
FMC is able to manage 2 SDRAM banks, but the current driver
implementation is only able to manage the first SDRAM bank.

Even if only bank2 is used, some bank1 registers must be
configured.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-07-26 11:29:15 -04:00

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ST, stm32 flexible memory controller Drive
Required properties:
- compatible : "st,stm32-fmc"
- reg : fmc controller base address
- clocks : fmc controller clock
u-boot,dm-pre-reloc: flag to initialize memory before relocation.
on-board sdram memory attributes:
- st,sdram-control : parameters for sdram configuration, in this order:
number of columns
number of rows
memory width
number of intenal banks in memory
cas latency
read burst enable or disable
read pipe delay
- st,sdram-timing: timings for sdram, in this order:
tmrd
txsr
tras
trc
trp
trcd
There is device tree include file at :
include/dt-bindings/memory/stm32-sdram.h to define sdram control and timing
parameters as MACROS.
Example:
fmc: fmc@A0000000 {
compatible = "st,stm32-fmc";
reg = <0xA0000000 0x1000>;
clocks = <&rcc 0 64>;
u-boot,dm-pre-reloc;
};
&fmc {
pinctrl-0 = <&fmc_pins>;
pinctrl-names = "default";
status = "okay";
/* sdram memory configuration from sdram datasheet */
bank1: bank@0 {
st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_2
CAS_3 RD_BURST_EN RD_PIPE_DL_0>;
st,sdram-timing = /bits/ 8 <TMRD_1 TXSR_60 TRAS_42 TRC_60 TRP_18
TRCD_18>;
};
/* sdram memory configuration from sdram datasheet */
bank2: bank@1 {
st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_2
CAS_3 RD_BURST_EN RD_PIPE_DL_0>;
st,sdram-timing = /bits/ 8 <TMRD_1 TXSR_60 TRAS_42 TRC_60 TRP_18
TRCD_18>;
};
}