Hi Angelo,
On 06/07/17 18:36, angelo wrote:
i designed here a new board with mcf54415. Testing a first mainline kernel.
I would like to load a cramfs rootfs from SPI NOR (mtd, ftl) but actually
i don't see the SPI NOR flash detected from dmesg.
Next future step then would be load rootfs from SD.
Seems there is no selectable driver for
- SPI controller
- SD (MMC) controller
Those should be similar to existing drivers of some other freescale chip,
or some new implementation is required ? Attaching dmesg.
Most other ColdFire parts use the QSPI hardware module, and its driver
is at drivers/spi/spi-coldfire-qspi.c. But, looking at the hardware
reference manual for the mcf5441x family it contains a DSPI hardware
module - and it looks quite different.
That DSPI module looks to be similar to the one in the Freescale iMX
parts, and its driver is at drivers/spi/spi-fsl-dspi.c. I don't know
that anyone has used that on ColdFire with the mcf5441x parts,
but that is where you should start I think.
I haven't used any SD/MMC drivers on ColdFire so no advice on where
to look for that one.
If you are feeling adventurous you may want to look at:
https://www.spinics.net/lists/linux-m68k/msg10057.html
With a reasonably recent kernel you don't even need to generate a
different user space filesystem and binaries. You can run your flat
format non-MMU binaries on an MMU configured ColdFire system (as long
as you have CONFIG_BINFMT_FLAT=y in your kernel config). I would love
to be able to push this patch to mainline.
Regards
Greg
Regards,
Angelo Dureghello
U-Boot 2017.05-00709-g9d9f074dfe-dirty (Jul 02 2017 - 19:50:16 +0200)
CPU: Freescale MCF54410 (Mask:9f Version:2)
CPU CLK 240 MHz BUS CLK 120 MHz FLB CLK 60 MHz
INP CLK 30 MHz VCO CLK 480 MHz
SPI: ready
DRAM: 128 MiB
SF: Detected is25lp128 with page size 256 Bytes, erase size 64 KiB,
total 16 MiB
In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0
SF: Detected is25lp128 with page size 256 Bytes, erase size 64 KiB,
total 16 MiB
device 0 offset 0x100000, size 0x200000
SF: 2097152 bytes @ 0x100000 Read: OK
## Booting kernel from Legacy Image at 40001000 ...
Image Name: mainline kernel
Created: 2017-07-05 23:58:53 UTC
Image Type: M68K Linux Kernel Image (uncompressed)
Data Size: 1642496 Bytes = 1.6 MiB
Load Address: 40001000
Entry Point: 40001000
Verifying Checksum ... OK
Loading Kernel Image ... OK
[ 0.000000] Linux version 4.10.0-rc2stmark2-001-00020-g0f64df301240
(angelo@jerusalem) (gcc version 4.9.0 (crosstools-sysam-2016.04.16) )
#16 Thu Jul 6 01:58:52 CEST 2017
[ 0.000000] uClinux with CPU COLDFIRE(m5441x)
[ 0.000000] COLDFIRE port done by Greg Ungerer, gerg@xxxxxxxxxxxx
[ 0.000000] Flat model support (C) 1998,1999 Kenneth Albanowski, D.
Jeff Dionne
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on.
Total pages: 16320
[ 0.000000] Kernel command line: console=ttyS0,115200
root=/dev/mtdblock3 mtdparts=spi-flash.0:1m(u-boot),7m(kernel),-(rootfs)
rw rootwait
[ 0.000000] PID hash table entries: 512 (order: -2, 2048 bytes)
[ 0.000000] Dentry cache hash table entries: 16384 (order: 3, 65536
bytes)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 2, 32768 bytes)
[ 0.000000] Memory: 128664K/131072K available (1154K kernel code, 92K
rwdata, 304K rodata, 48K init, 121K bss, 2408K reserved, 0K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0x40000000 - 0x40000400 ( 1 KiB)
[ 0.000000] kmap : 0x00000000 - 0xffffffff (4095 MiB)
[ 0.000000] vmalloc : 0x00000000 - 0xfffff ----- Message
truncated -----
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