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--- etc:users:jcmvbkbc:xtensa-linux [2011/06/20 00:51] – fix for wrong address generated for jump in kernel_exception_return jcmvbkbc
+++ users:jcmvbkbc:xtensa-linux [2016/08/07 00:34] – ↷ Page moved from user:jcmvbkbc:xtensa-linux to users:jcmvbkbc:xtensa-linux kel
@@ Line 1: / Line 1: @@
 ====== Booting xtensa linux on qemu ======
+It boots:
+<file>
+parse_bootparam(phys_tag:fe000020):
+Linux version 2.6.29-rc7-ga0f0129-dirty (dumb@octofox.metropolis) (gcc version 4.4.5 (GCC) ) #10 Tue Jun 21 23:13:31 MSD 2011
+bootmem_init: sysmem.bank[i:0].{type:0, start:0x1000, end:0x3000}
+bootmem_init: sysmem.bank[i:1].{type:0, start:0x142000, end:0x8000000}
+bootmem_init: min_low_pfn:0x1, max_low_pfn:0x8000, max_pfn:0x8000
+Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32480
+Kernel command line: console=ttyS0,38400 root=/dev/simdisk0 init=/init
+trap_init:
+PID hash table entries: 512 (order: 9, 2048 bytes)
+time_init: Platform Calibrating CPU frequency
+__platform_calibrate_ccount: No Platform Specific routine available to calibrate cpu frequency!
+__platform_calibrate_ccount: Using Defaults derived from kernel .config file.
+time_init: ccount_per_jiffy:100000 [10.00 MHz], nsec_per_ccount:100
+console [ttyS0] enabled
+Console: colour dummy device 80x25
+Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
+Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
+Memory: 128380k/131072k available (865k kernel code, 2536k reserved, 53k data, 48k init 0k highmem)
+SLUB: Genslabs=12, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
+calibrate_delay: Calibrating delay loop (skipped)... 10.00 BogoMIPS preset
+Mount-cache hash table entries: 512
+net_namespace: 520 bytes
+NET: Registered protocol family 16
+bio: create slab <bio-0> at 0
+NET: Registered protocol family 2
+IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
+TCP established hash table entries: 4096 (order: 3, 32768 bytes)
+TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
+TCP: Hash tables configured (established 4096 bind 4096)
+TCP reno registered
+NET: Registered protocol family 1
+simdisk_init: SIMDISK: major: 240
+simdisk_attach(dev:d7809000, filename:'x')
+simdisk_attach: SIMDISK: disk_name:'simdisk0', filename:'x'
+simdisk_attach(dev:d780941c, filename:'x')
+simdisk_attach: SIMDISK: disk_name:'simdisk1', filename:'x'
+msgmni has been set to 251
+io scheduler noop registered (default)
+loop: module loaded
+Software Watchdog Timer: 0.07 initialized. soft_noboot=0 soft_margin=60 sec (nowayout= 1)
+TCP cubic registered
+NET: Registered protocol family 17
+ISS serial driver 0.1
+VFS: Mounted root (ext2 filesystem) readonly on device 240:0.
+free_initmem: Freeing unused/init kernel memory: ... 48k freed
+EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
+Starting portmap: done
+Initializing random number generator... done.
+Starting network...
+ip: RTNETLINK answers: File exists
+Welcome to your custom Xtensa processor based uClibc environment.
+uclibc login:
+</file>
 ===== Issues =====
@@ Line 59: / Line 120: @@
         retw                            # rotate back by 4 registers, possibly with underflow
                                         # Back out our _entry Frame above...
+</code>
+==== Random symbols appear like being typed on the console ====
+There's no checks for select simcall error status (or maybe there just should not be EINTR error, that's just not documented). Fix is the following:
+<code>
+diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
+index e650152..285744e 100644
+--- a/arch/xtensa/platforms/iss/console.c
++++ b/arch/xtensa/platforms/iss/console.c
+@@ -126,10 +126,11 @@ static void rs_poll(unsigned long priv)
+        spin_lock(&timer_lock);
+-       while (__simc(SYS_select_one, 0, XTISS_SELECT_ONE_READ, (int)&tv,0,0)){
+-               __simc (SYS_read, 0, (unsigned long)&c, 1, 0, 0);
+-               tty_insert_flip_char(tty, c, TTY_NORMAL);
+-               i++;
++       while (__simc(SYS_select_one, 0, XTISS_SELECT_ONE_READ, (int)&tv,0,0) > 0) {
++               if (__simc (SYS_read, 0, (unsigned long)&c, 1, 0, 0) == 1) {
++                       tty_insert_flip_char(tty, c, TTY_NORMAL);
++                       i++;
++               }
+        }
+        if (i)
+</code>
+==== Console is tooooo slooooow ====
+There's polling timer, it's 20 seconds :(). Fix is the following:
+<code>
+diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
+index e650152..285744e 100644
+--- a/arch/xtensa/platforms/iss/console.c
++++ b/arch/xtensa/platforms/iss/console.c
+@@ -35,7 +35,7 @@
+ #endif
+ #define SERIAL_MAX_NUM_LINES 1
+-#define SERIAL_TIMER_VALUE (20 * HZ)
++#define SERIAL_TIMER_VALUE (HZ / 10)
+ static struct tty_driver *serial_driver;
+ static struct timer_list serial_timer;
 </code>