FreeBSD on Raspberry Pi 512MB (with U-Boot + ubldr)
Ralf.Wenk at hs-karlsruhe.de
Ralf.Wenk at hs-karlsruhe.de
Mon Dec 3 14:08:23 UTC 2012
Hello,
>> BTW, SDHCI is not yet stable?
>
> There is one issue with setting SDHCI clock. I'll commit fix later today.
I like to share some information about the SD card reading speed.
While exchanging the old boot sequence with then new one I once booted
with the new boot sequence but without an /boot/loader.rc file.
The reading speed achieved with
dd if=/dev/mmcsd0 of=/dev/null bs=1m count=100
from the SD card was 10 Mbyte/sec.
After creating the file with "echo 'fdt addr 0x100' > /boot/loader.rc"
and rebooting the reading speed achieved from the SD card was down to
2.8 Mbyte/sec.
Although the SDHCI frequency was shown on the second boot as double high as
on the first (100MHz versus 50MHz) the reading speed was much lower.
I think the cause was the mmcsd bus bit width which was reported as 4 at
the first and as 1 at the second boot.
Deleting /boot/loader.rc or changing the SDHCI frequency down to 50Hz did
not regain the 4 mmcsd bus bit width shown at the first boot.
The differences between the boot messages are:
$ diff -u rpi-with-newbios rpi-with-newbios-lr
--- rpi-with-newbios 2012-12-01 13:40:03.000000000 +0100
+++ rpi-with-newbios-lr 2012-12-01 13:38:14.000000000 +0100
@@ -30,11 +30,10 @@
DRAM: 384MB
Device: disk
--
+\
/boot/kernel/kernel data=0x35f5f8+0x1fe84 syms=[0x4+0x79640+0x4+0x5cfdf]
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
-fdt_start: 0x00439650
Kernel entry at 0x100100...
Kernel args: (null)
KDB: debugger backends: ddb
@@ -50,8 +49,8 @@
WB enabled LABT branch prediction enabled
16KB/32B 4-way instruction cache
16KB/32B 4-way write-back-locking-C data cache
-real memory = 134217728 (128 MB)
-avail memory = 125120512 (119 MB)
+real memory = 536870912 (512 MB)
+avail memory = 386912256 (368 MB)
random device not loaded; using insecure entropy
simplebus0: <Flattened device tree simple bus> mem 0xf2000000-0xf2ffffff on
fdtbus0
intc0: <BCM2835 Interrupt Controller> mem 0xf200b200-0xf200b3ff on simplebus0
@@ -59,7 +58,7 @@
Event timer "BCM2835 Event Timer 3" frequency 1000000 Hz quality 1000
Timecounter "BCM2835 Timecounter" frequency 1000000 Hz quality 1000
sdhci_bcm0: <Broadcom 2708 SDHCI controller> mem 0xf2300000-0xf23000ff irq 70
on simplebus0
-bcm_sdhci_attach(): SDHCI frequency: 50MHz
+bcm_sdhci_attach(): SDHCI frequency: 100MHz
mmc0: <MMC/SD bus> on sdhci_bcm0
mbox0: <BCM2835 VideoCore Mailbox> mem 0xf200b880-0xf200b8bf irq 1 on
simplebus0
mbox0: [GIANT-LOCKED]
@@ -77,13 +76,12 @@
usbus0: 480Mbps High Speed USB v2.0
ugen0.1: <DWCOTG> at usbus0
uhub0: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
-mmcsd0: 3781MB <SDHC SD04G 8.0 SN 288979219 MFG 09/2011 by 3 SD> at mmc0
25.0MHz/4bit/65535-block
+mmcsd0: 3781MB <SDHC SD04G 8.0 SN 288979219 MFG 09/2011 by 3 SD> at mmc0
25.0MHz/1bit/65535-block
Root mount waiting for: usbus0
uhub0: 1 port with 1 removable, self powered
ugen0.2: <vendor 0x0424> at usbus0
uhub1: <vendor 0x0424 product 0x9512, class 9/0, rev 2.00/2.00, addr 2> on
usbus0
uhub1: MTT enabled
-Root mount waiting for: usbus0
uhub1: 3 ports with 2 removable, self powered
Root mount waiting for: usbus0
ugen0.3: <vendor 0x0424> at usbus0
@@ -95,14 +93,14 @@
@@ -102,7 +100,7 @@
Entropy harvesting: interrupts ethernet point_to_point kickstart.
Starting file system checks:
/dev/mmcsd0s2a: FILE SYSTEM CLEAN; SKIPPING CHECKS
-/dev/mmcsd0s2a: clean, 393149 free (1125 frags, 49003 blocks, 0.2%
fragmentation)
+/dev/mmcsd0s2a: clean, 393117 free (1125 frags, 48999 blocks, 0.2%
fragmentation)
Mounting local file systems:.
Writing entropy file:.
Setting hostname: raspberry-pi.
First boot:
root at raspberry-pi:~ # dd if=/dev/mmcsd0 of=/dev/null bs=1m count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 9.715465 secs (10792855 bytes/sec)
Second boot:
root at raspberry-pi:~ # dd if=/dev/mmcsd0 of=/dev/null bs=1m count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 36.061109 secs (2907775 bytes/sec)
Kind regards, Ralf
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