linux/arch/microblaze/kernel/head.S, branch v4.5

microblaze: Fix typo in head.S s/substract/subtract/

2014-06-05T11:02:02Z

Signed-off-by: Antonio Ospite Cc: Michal Simek Cc: "Edgar E. Iglesias" Signed-off-by: Michal Simek

microblaze: Fix a typo when disabling stack protection

2014-02-10T06:44:11Z

Correct a typo causing the stack protector to be left enabled. 0xFFFFFFF -> 0xFFFFFFFF Signed-off-by: Edgar E. Iglesias Tested-by: Guenter Roeck Signed-off-by: Michal Simek

microblaze: Disable stack protection from bootloader

2014-01-27T10:26:32Z

Microblaze without MMU can use stack protection in bootloader and kernel should clear this setting ASAP. Signed-off-by: Michal Simek

microblaze: Calculate kernel pad automatically

2013-11-07T08:22:40Z

The kernel needs to setup the first two tlbs with pad which is used for early page allocation which is used by mapin_ram() to allocate tables for lowmem memory before memory initialisation is done. Calculate pad directly from lowmem size. Signed-off-by: Michal Simek

microblaze: Do not use r6 in head.S

2013-05-09T07:01:21Z

r6 stores pointer to ramdisk and shouldn't be used before it is passed to machine_early_init. Signed-off-by: Michal Simek

microblaze: Fix bug with passing command line

2012-10-04T12:59:19Z

When u-boot passes control over to Linux it places the Linux command line between to the end of __init_end. When space between __init_end and __bss_start is not COMMAND_LINE_SIZE then the part of cmdline can be lost. In extreme case if __init_end == __bss_start u-boot can't pass any cmdline to Linux kernel. This patch fix this issue by copying cmd line directly to cmd_line char array which is placed in data section. Reported-by: David Mc Andrew Signed-off-by: Michal Simek

microblaze: Handle TLB skip size dynamically

2012-03-23T08:28:19Z

This patch fix the problem with rootfs on JFFS2 with early printk console turned on. The origin version used TLB63 for temporary early printk mapping. The code expect that kernel is not able to use all 64 TLB entries till early printk console is remapped by ioremap. After that temporary mapping on TLB63 is silently lost. This expectation give the opportunity to have early console pretty early. Microblaze systems with JFFS2 rootfs with early printk console turned on used more than 64 TLB entries before kernel can remap early console. Based on that kernel does access to bad area because early printk mapping is rewritten. This patch introduces tlb_skip variable which dynamically stores number of skipped TLB entries from the TLB0. skip_tlb=2 means that TLB0 and TLB1 should be skipped. MICROBLAZE_TLB_SKIP defines how many TLB is skipped at the kernel start. They can be used for user purpose. TLB 63 is used for temporary LMB mapping (MICROBLAZE_LMB_TLB_ID). Also clean TLBLO when kernel starts. For specific kernel sizes kernel can use just one TLB. Detect this case and use the second TLB for general purpose. Change _tlbia function to flush TLB entries from tlb_skip to TLB_SIZE. Export tlb_skip size through debugfs. Signed-off-by: Michal Simek

microblaze: Improve TLB calculation for small systems

2012-03-23T08:28:18Z

Systems with small amount of memory need to be handled differently. Linux can't allocate the whole 32MB with two TLBs because then there is no MMU protection. Signed-off-by: Michal Simek

microblaze: Extend space for compiled-in FDT to 32kB

2012-03-23T08:28:17Z

Signed-off-by: Michal Simek

microblaze: Clear all MSR flags on the first kernel instruction

2012-03-23T08:28:16Z

The main reason is bug because of dynamic TLB allocation. U-BOOT didn't disable dcache and then writing to physical address from ASM wan't visible for reading through MMU. Disabling caches and clearing all flags from previous code is good to do so. Signed-off-by: Michal Simek