diff options
author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-03-17 13:44:45 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-03-17 13:44:45 +0000 |
commit | c986d73e782c6b7f59c8d79185d845f16d5f6034 (patch) | |
tree | ca6641d52555041f06ac6cd20f8b9ad42fd096d2 /nuttx | |
parent | 33b868cdc66ba55a3849bcb953e16a6ff96c1bcd (diff) | |
download | px4-nuttx-c986d73e782c6b7f59c8d79185d845f16d5f6034.tar.gz px4-nuttx-c986d73e782c6b7f59c8d79185d845f16d5f6034.tar.bz2 px4-nuttx-c986d73e782c6b7f59c8d79185d845f16d5f6034.zip |
Documentation updates
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3388 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx')
-rw-r--r-- | nuttx/Documentation/NuttX.html | 4 | ||||
-rw-r--r-- | nuttx/Documentation/NuttxPortingGuide.html | 60 | ||||
-rw-r--r-- | nuttx/arch/README.txt | 2 | ||||
-rwxr-xr-x | nuttx/arch/x86/include/i486/irq.h | 54 | ||||
-rwxr-xr-x | nuttx/arch/x86/include/qemu/irq.h | 52 | ||||
-rwxr-xr-x | nuttx/arch/x86/src/i486/up_irq.c | 116 | ||||
-rw-r--r-- | nuttx/configs/README.txt | 44 |
7 files changed, 213 insertions, 119 deletions
diff --git a/nuttx/Documentation/NuttX.html b/nuttx/Documentation/NuttX.html index a7d66da8c..1ac727263 100644 --- a/nuttx/Documentation/NuttX.html +++ b/nuttx/Documentation/NuttX.html @@ -8,7 +8,7 @@ <tr align="center" bgcolor="#e4e4e4"> <td> <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1> - <p>Last Updated: March 15, 2011</p> + <p>Last Updated: March 16, 2011</p> </td> </tr> </table> @@ -2200,6 +2200,8 @@ nuttx-5.20 2011-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr> * drivers/net/slip.c -- SLIP is now basically functional on the LPC17xx with some caveats as described in the TODO list under LPC17xx. + * arch/x86/include/i486/irq.h -- Fix irqrestore() macro... it was not + correctly re-enabling interrupts. apps-5.20 2011-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr> diff --git a/nuttx/Documentation/NuttxPortingGuide.html b/nuttx/Documentation/NuttxPortingGuide.html index c9d7f6bd2..d7f65090f 100644 --- a/nuttx/Documentation/NuttxPortingGuide.html +++ b/nuttx/Documentation/NuttxPortingGuide.html @@ -12,7 +12,7 @@ <h1><big><font color="#3c34ec"> <i>NuttX RTOS Porting Guide</i> </font></big></h1> - <p>Last Updated: March 12, 2011</p> + <p>Last Updated: March 16, 2011</p> </td> </tr> </table> @@ -3305,16 +3305,17 @@ build </li> <li> <code>CONFIG_NET_SLIP</code>: Selects the Serial Line Internet Protocol (SLIP) data link layer. - The default data link layer for uIP is Ethernet. - If <code>CONFIG_NET_SLIP</code> is defined in the NuttX header file, then SLIP will be supported. - The basic differences between the SLIP and Ethernet configurations is that when SLIP is selected: - <ul> - <li>The link level header (that comes before the IP header) is omitted.</li> - <li>All MAC address processing is suppressed.</li> - <li>ARP is disabled.</li> - </ul> - If <code>CONFIG_NET_SLIP</code> is not supported, then Ethernet will be used - (there is no need to define anything special in the configuration file to use Ethernet -- it is the default). + (This selection is discussed further <a href="#slipdriver">below</a>). + </li> + <li> + <code>CONFIG_NET_NOINTS</code>: <code>CONFIG_NET_NOINT</code> indicates that uIP not called from the interrupt level. + If <code>CONFIG_NET_NOINTS</code> is defined, critical sections will be managed with semaphores; + Otherwise, it assumed that uIP will be called from interrupt level handling and critical sections will be managed by enabling and disabling interrupts. + </li> + <li> + <code>CONFIG_NET_MULTIBUFFER</code>: Traditionally, uIP has used a single buffer for all incoming and outgoing traffic. + If this configuration is selected, then the driver can manage multiple I/O buffers and can, for example, be filling one input buffer while sending another output buffer. + Or, as another example, the driver may support queuing of concurrent input/ouput and output transfers for better performance. </li> <li> <code>CONFIG_NET_IPv6</code>: Build in support for IPv6 @@ -3408,6 +3409,43 @@ build </li> </ul> +<h3><a name="slipdriver">SLIP</a></h3> +<p> + The NuttX SLIP driver supports point-to-point IP communications over a serial port. + The default data link layer for uIP is Ethernet. + If <code>CONFIG_NET_SLIP</code> is defined in the NuttX configuration file, then SLIP will be supported. + The basic differences between the SLIP and Ethernet configurations is that when SLIP is selected: + <ul> + <li>The link level header (that comes before the IP header) is omitted.</li> + <li>All MAC address processing is suppressed.</li> + <li>ARP is disabled.</li> + </ul> + If <code>CONFIG_NET_SLIP</code> is not selected, then Ethernet will be used + (there is no need to define anything special in the configuration file to use Ethernet -- it is the default). +</p> +<ul> + <li> + <code>CONFIG_NET_SLIP</code>: Enables building of the SLIP driver. + SLIP requires at least one IP protocols selected and the following additional network settings: <code>CONFIG_NET_NOINTS</code> and <code>CONFIG_NET_MULTIBUFFER</code>. + <code>CONFIG_NET_BUFSIZE</code> <i>must</i> be set to 296. + Other optional configuration settings that affect the SLIP driver: <code>CONFIG_NET_STATISTICS</code>. + Default: Ethernet. + </li> + <p> + If SLIP is selected, then the following SLIP options are available: + </p> + <li> + <code>CONFIG_CLIP_NINTERFACES</code>: Selects the number of physical SLIP interfaces to support. Default: 1 + </li> + <li> + <code>CONFIG_SLIP_STACKSIZE</code>: Select the stack size of the SLIP RX and TX tasks. Default: 2048 + </li> + <li> + <code>CONFIG_SLIP_DEFPRIO</code>: The priority of the SLIP RX and TX tasks. Default: 128 + </li> + </li> +</ul> + <h3>UIP Network Utilities</h3> <ul> <li> diff --git a/nuttx/arch/README.txt b/nuttx/arch/README.txt index 8bcdda6e6..fdcf915ec 100644 --- a/nuttx/arch/README.txt +++ b/nuttx/arch/README.txt @@ -271,8 +271,6 @@ arch/x86 - Intel x86 architectures arch/x86/include/qemu and arch/x86/src/qemu This is the implementation of NuttX on the QEMU x86 simulation. - STATUS: This is a work in progress and not yet ready for prime time. - arch/z16 - ZiLOG 16-bit processors This directory holds related, 16-bit architectures from ZiLOG. At present, this includes the following subdirectories: diff --git a/nuttx/arch/x86/include/i486/irq.h b/nuttx/arch/x86/include/i486/irq.h index 0abf384ea..9b1162671 100755 --- a/nuttx/arch/x86/include/i486/irq.h +++ b/nuttx/arch/x86/include/i486/irq.h @@ -54,6 +54,60 @@ * Definitions ****************************************************************************/ +/* ISR and IRQ numbers */ + +#define ISR0 0 +#define ISR1 1 +#define ISR2 2 +#define ISR3 3 +#define ISR4 4 +#define ISR5 5 +#define ISR6 6 +#define ISR7 7 +#define ISR8 8 +#define ISR9 9 +#define ISR10 10 +#define ISR11 11 +#define ISR12 12 +#define ISR13 13 +#define ISR14 14 +#define ISR15 15 +#define ISR16 16 +#define ISR17 17 +#define ISR18 18 +#define ISR19 19 +#define ISR20 20 +#define ISR21 21 +#define ISR22 22 +#define ISR23 23 +#define ISR24 24 +#define ISR25 25 +#define ISR26 26 +#define ISR27 27 +#define ISR28 28 +#define ISR29 29 +#define ISR30 30 +#define ISR31 31 + +#define IRQ0 32 +#define IRQ1 33 +#define IRQ2 34 +#define IRQ3 35 +#define IRQ4 36 +#define IRQ5 37 +#define IRQ6 38 +#define IRQ7 39 +#define IRQ8 40 +#define IRQ9 41 +#define IRQ10 42 +#define IRQ11 43 +#define IRQ12 44 +#define IRQ13 45 +#define IRQ14 46 +#define IRQ15 47 + +#define NR_IRQS 48 + /* Common register save structgure created by up_saveusercontext() and by * ISR/IRQ interrupt processing. */ diff --git a/nuttx/arch/x86/include/qemu/irq.h b/nuttx/arch/x86/include/qemu/irq.h index ef834b271..23611b83c 100755 --- a/nuttx/arch/x86/include/qemu/irq.h +++ b/nuttx/arch/x86/include/qemu/irq.h @@ -48,58 +48,6 @@ * Definitions ****************************************************************************/ -#define ISR0 0 -#define ISR1 1 -#define ISR2 2 -#define ISR3 3 -#define ISR4 4 -#define ISR5 5 -#define ISR6 6 -#define ISR7 7 -#define ISR8 8 -#define ISR9 9 -#define ISR10 10 -#define ISR11 11 -#define ISR12 12 -#define ISR13 13 -#define ISR14 14 -#define ISR15 15 -#define ISR16 16 -#define ISR17 17 -#define ISR18 18 -#define ISR19 19 -#define ISR20 20 -#define ISR21 21 -#define ISR22 22 -#define ISR23 23 -#define ISR24 24 -#define ISR25 25 -#define ISR26 26 -#define ISR27 27 -#define ISR28 28 -#define ISR29 29 -#define ISR30 30 -#define ISR31 31 - -#define IRQ0 32 -#define IRQ1 33 -#define IRQ2 34 -#define IRQ3 35 -#define IRQ4 36 -#define IRQ5 37 -#define IRQ6 38 -#define IRQ7 39 -#define IRQ8 40 -#define IRQ9 41 -#define IRQ10 42 -#define IRQ11 43 -#define IRQ12 44 -#define IRQ13 45 -#define IRQ14 46 -#define IRQ15 47 - -#define NR_IRQS 48 - /**************************************************************************** * Public Types ****************************************************************************/ diff --git a/nuttx/arch/x86/src/i486/up_irq.c b/nuttx/arch/x86/src/i486/up_irq.c index c77936b4f..627c727de 100755 --- a/nuttx/arch/x86/src/i486/up_irq.c +++ b/nuttx/arch/x86/src/i486/up_irq.c @@ -64,8 +64,8 @@ static void idt_outb(uint8_t val, uint16_t addr) __attribute__((noinline)); static void up_remappic(void); -static void up_idtentry(struct idt_entry_s *entry, uint32_t base, - uint16_t sel, uint8_t flags); +static void up_idtentry(unsigned int index, uint32_t base, uint16_t sel, + uint8_t flags); static inline void up_idtinit(void); /**************************************************************************** @@ -153,9 +153,11 @@ static void up_remappic(void) * ****************************************************************************/ -static void up_idtentry(struct idt_entry_s *entry, uint32_t base, - uint16_t sel, uint8_t flags) +static void up_idtentry(unsigned int index, uint32_t base, uint16_t sel, + uint8_t flags) { + struct idt_entry_s *entry = &idt_entries[index]; + entry->lobase = base & 0xffff; entry->hibase = (base >> 16) & 0xffff; @@ -189,56 +191,66 @@ static inline void up_idtinit(void) memset(&idt_entries, 0, sizeof(struct idt_entry_s)*256); + /* Re-map the PIC */ + up_remappic(); - up_idtentry(&idt_entries[0], (uint32_t)vector_isr0 , 0x08, 0x8e); - up_idtentry(&idt_entries[1], (uint32_t)vector_isr1 , 0x08, 0x8e); - up_idtentry(&idt_entries[2], (uint32_t)vector_isr2 , 0x08, 0x8e); - up_idtentry(&idt_entries[3], (uint32_t)vector_isr3 , 0x08, 0x8e); - up_idtentry(&idt_entries[4], (uint32_t)vector_isr4 , 0x08, 0x8e); - up_idtentry(&idt_entries[5], (uint32_t)vector_isr5 , 0x08, 0x8e); - up_idtentry(&idt_entries[6], (uint32_t)vector_isr6 , 0x08, 0x8e); - up_idtentry(&idt_entries[7], (uint32_t)vector_isr7 , 0x08, 0x8e); - up_idtentry(&idt_entries[8], (uint32_t)vector_isr8 , 0x08, 0x8e); - up_idtentry(&idt_entries[9], (uint32_t)vector_isr9 , 0x08, 0x8e); - up_idtentry(&idt_entries[10], (uint32_t)vector_isr10, 0x08, 0x8e); - up_idtentry(&idt_entries[11], (uint32_t)vector_isr11, 0x08, 0x8e); - up_idtentry(&idt_entries[12], (uint32_t)vector_isr12, 0x08, 0x8e); - up_idtentry(&idt_entries[13], (uint32_t)vector_isr13, 0x08, 0x8e); - up_idtentry(&idt_entries[14], (uint32_t)vector_isr14, 0x08, 0x8e); - up_idtentry(&idt_entries[15], (uint32_t)vector_isr15, 0x08, 0x8e); - up_idtentry(&idt_entries[16], (uint32_t)vector_isr16, 0x08, 0x8e); - up_idtentry(&idt_entries[17], (uint32_t)vector_isr17, 0x08, 0x8e); - up_idtentry(&idt_entries[18], (uint32_t)vector_isr18, 0x08, 0x8e); - up_idtentry(&idt_entries[19], (uint32_t)vector_isr19, 0x08, 0x8e); - up_idtentry(&idt_entries[20], (uint32_t)vector_isr20, 0x08, 0x8e); - up_idtentry(&idt_entries[21], (uint32_t)vector_isr21, 0x08, 0x8e); - up_idtentry(&idt_entries[22], (uint32_t)vector_isr22, 0x08, 0x8e); - up_idtentry(&idt_entries[23], (uint32_t)vector_isr23, 0x08, 0x8e); - up_idtentry(&idt_entries[24], (uint32_t)vector_isr24, 0x08, 0x8e); - up_idtentry(&idt_entries[25], (uint32_t)vector_isr25, 0x08, 0x8e); - up_idtentry(&idt_entries[26], (uint32_t)vector_isr26, 0x08, 0x8e); - up_idtentry(&idt_entries[27], (uint32_t)vector_isr27, 0x08, 0x8e); - up_idtentry(&idt_entries[28], (uint32_t)vector_isr28, 0x08, 0x8e); - up_idtentry(&idt_entries[29], (uint32_t)vector_isr29, 0x08, 0x8e); - up_idtentry(&idt_entries[30], (uint32_t)vector_isr30, 0x08, 0x8e); - up_idtentry(&idt_entries[31], (uint32_t)vector_isr31, 0x08, 0x8e); - up_idtentry(&idt_entries[32], (uint32_t)vector_irq0, 0x08, 0x8e); - up_idtentry(&idt_entries[33], (uint32_t)vector_irq1, 0x08, 0x8e); - up_idtentry(&idt_entries[34], (uint32_t)vector_irq2, 0x08, 0x8e); - up_idtentry(&idt_entries[35], (uint32_t)vector_irq3, 0x08, 0x8e); - up_idtentry(&idt_entries[36], (uint32_t)vector_irq4, 0x08, 0x8e); - up_idtentry(&idt_entries[37], (uint32_t)vector_irq5, 0x08, 0x8e); - up_idtentry(&idt_entries[38], (uint32_t)vector_irq6, 0x08, 0x8e); - up_idtentry(&idt_entries[39], (uint32_t)vector_irq7, 0x08, 0x8e); - up_idtentry(&idt_entries[40], (uint32_t)vector_irq8, 0x08, 0x8e); - up_idtentry(&idt_entries[41], (uint32_t)vector_irq9, 0x08, 0x8e); - up_idtentry(&idt_entries[42], (uint32_t)vector_irq10, 0x08, 0x8e); - up_idtentry(&idt_entries[43], (uint32_t)vector_irq11, 0x08, 0x8e); - up_idtentry(&idt_entries[44], (uint32_t)vector_irq12, 0x08, 0x8e); - up_idtentry(&idt_entries[45], (uint32_t)vector_irq13, 0x08, 0x8e); - up_idtentry(&idt_entries[46], (uint32_t)vector_irq14, 0x08, 0x8e); - up_idtentry(&idt_entries[47], (uint32_t)vector_irq15, 0x08, 0x8e); + /* Set each ISR/IRQ to the appropriate vector with selector=8 and with + * 32-bit interrupt gate. Interrupt gate (vs. trap gate) will leave + * interrupts enabled when the IRS/IRQ handler is entered. + */ + + up_idtentry(ISR0, (uint32_t)vector_isr0 , 0x08, 0x8e); + up_idtentry(ISR1, (uint32_t)vector_isr1 , 0x08, 0x8e); + up_idtentry(ISR2, (uint32_t)vector_isr2 , 0x08, 0x8e); + up_idtentry(ISR3, (uint32_t)vector_isr3 , 0x08, 0x8e); + up_idtentry(ISR4, (uint32_t)vector_isr4 , 0x08, 0x8e); + up_idtentry(ISR5, (uint32_t)vector_isr5 , 0x08, 0x8e); + up_idtentry(ISR6, (uint32_t)vector_isr6 , 0x08, 0x8e); + up_idtentry(ISR7, (uint32_t)vector_isr7 , 0x08, 0x8e); + up_idtentry(ISR8, (uint32_t)vector_isr8 , 0x08, 0x8e); + up_idtentry(ISR9, (uint32_t)vector_isr9 , 0x08, 0x8e); + up_idtentry(ISR10, (uint32_t)vector_isr10, 0x08, 0x8e); + up_idtentry(ISR11, (uint32_t)vector_isr11, 0x08, 0x8e); + up_idtentry(ISR12, (uint32_t)vector_isr12, 0x08, 0x8e); + up_idtentry(ISR13, (uint32_t)vector_isr13, 0x08, 0x8e); + up_idtentry(ISR14, (uint32_t)vector_isr14, 0x08, 0x8e); + up_idtentry(ISR15, (uint32_t)vector_isr15, 0x08, 0x8e); + up_idtentry(ISR16, (uint32_t)vector_isr16, 0x08, 0x8e); + up_idtentry(ISR17, (uint32_t)vector_isr17, 0x08, 0x8e); + up_idtentry(ISR18, (uint32_t)vector_isr18, 0x08, 0x8e); + up_idtentry(ISR19, (uint32_t)vector_isr19, 0x08, 0x8e); + up_idtentry(ISR20, (uint32_t)vector_isr20, 0x08, 0x8e); + up_idtentry(ISR21, (uint32_t)vector_isr21, 0x08, 0x8e); + up_idtentry(ISR22, (uint32_t)vector_isr22, 0x08, 0x8e); + up_idtentry(ISR23, (uint32_t)vector_isr23, 0x08, 0x8e); + up_idtentry(ISR24, (uint32_t)vector_isr24, 0x08, 0x8e); + up_idtentry(ISR25, (uint32_t)vector_isr25, 0x08, 0x8e); + up_idtentry(ISR26, (uint32_t)vector_isr26, 0x08, 0x8e); + up_idtentry(ISR27, (uint32_t)vector_isr27, 0x08, 0x8e); + up_idtentry(ISR28, (uint32_t)vector_isr28, 0x08, 0x8e); + up_idtentry(ISR29, (uint32_t)vector_isr29, 0x08, 0x8e); + up_idtentry(ISR30, (uint32_t)vector_isr30, 0x08, 0x8e); + up_idtentry(ISR31, (uint32_t)vector_isr31, 0x08, 0x8e); + + up_idtentry(IRQ0, (uint32_t)vector_irq0, 0x08, 0x8e); + up_idtentry(IRQ1, (uint32_t)vector_irq1, 0x08, 0x8e); + up_idtentry(IRQ2, (uint32_t)vector_irq2, 0x08, 0x8e); + up_idtentry(IRQ3, (uint32_t)vector_irq3, 0x08, 0x8e); + up_idtentry(IRQ4, (uint32_t)vector_irq4, 0x08, 0x8e); + up_idtentry(IRQ5, (uint32_t)vector_irq5, 0x08, 0x8e); + up_idtentry(IRQ6, (uint32_t)vector_irq6, 0x08, 0x8e); + up_idtentry(IRQ7, (uint32_t)vector_irq7, 0x08, 0x8e); + up_idtentry(IRQ8, (uint32_t)vector_irq8, 0x08, 0x8e); + up_idtentry(IRQ9, (uint32_t)vector_irq9, 0x08, 0x8e); + up_idtentry(IRQ10, (uint32_t)vector_irq10, 0x08, 0x8e); + up_idtentry(IRQ11, (uint32_t)vector_irq11, 0x08, 0x8e); + up_idtentry(IRQ12, (uint32_t)vector_irq12, 0x08, 0x8e); + up_idtentry(IRQ13, (uint32_t)vector_irq13, 0x08, 0x8e); + up_idtentry(IRQ14, (uint32_t)vector_irq14, 0x08, 0x8e); + up_idtentry(IRQ15, (uint32_t)vector_irq15, 0x08, 0x8e); + + /* Then program the IDT */ idt_flush((uint32_t)&idt_ptr); } diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt index 723656a85..55dc6bdd3 100644 --- a/nuttx/configs/README.txt +++ b/nuttx/configs/README.txt @@ -585,8 +585,20 @@ defconfig -- This is a configuration file similar to the Linux CONFIG_ENC28J60_STATS - Collect network statistics CONFIG_ENC28J60_HALFDUPPLEX - Default is full duplex - TCP/IP and UDP support via uIP + Networking support via uIP CONFIG_NET - Enable or disable all network features + CONFIG_NET_NOINTS -- CONFIG_NET_NOINT indicates that uIP not called from + the interrupt level. If CONFIG_NET_NOINTS is defined, critical sections + will be managed with semaphores; Otherwise, it assumed that uIP will be + called from interrupt level handling and critical sections will be + managed by enabling and disabling interrupts. + CONFIG_NET_MULTIBUFFER - Traditionally, uIP has used a single buffer + for all incoming and outgoing traffic. If this configuration is + selected, then the driver can manage multiple I/O buffers and can, + for example, be filling one input buffer while sending another + output buffer. Or, as another example, the driver may support + queuing of concurrent input/ouput and output transfers for better + performance. CONFIG_NET_IPv6 - Build in support for IPv6 CONFIG_NSOCKET_DESCRIPTORS - Maximum number of socket descriptors per task/thread. @@ -632,6 +644,36 @@ defconfig -- This is a configuration file similar to the Linux CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates + SLIP Driver. SLIP supports point-to-point IP communications over a serial + port. The default data link layer for uIP is Ethernet. If CONFIG_NET_SLIP + is defined in the NuttX configuration file, then SLIP will be supported. + The basic differences between the SLIP and Ethernet configurations is that + when SLIP is selected: + + * The link level header (that comes before the IP header) is omitted. + * All MAC address processing is suppressed. + * ARP is disabled. + + If CONFIG_NET_SLIP is not selected, then Ethernet will be used (there is + no need to define anything special in the configuration file to use + Ethernet -- it is the default). + + CONFIG_NET_SLIP -- Enables building of the SLIP driver. SLIP requires + at least one IP protocols selected and the following additional + network settings: CONFIG_NET_NOINTS and CONFIG_NET_MULTIBUFFER. + CONFIG_NET_BUFSIZE *must* be set to 296. Other optional configuration + settings that affect the SLIP driver: CONFIG_NET_STATISTICS. + Default: Ethernet + + If SLIP is selected, then the following SLIP options are available: + + CONFIG_CLIP_NINTERFACES -- Selects the number of physical SLIP + interfaces to support. Default: 1 + CONFIG_SLIP_STACKSIZE -- Select the stack size of the SLIP RX and + TX tasks. Default: 2048 + CONFIG_SLIP_DEFPRIO - The priority of the SLIP RX and TX tasks. + Default: 128 + UIP Network Utilities CONFIG_NET_DHCP_LIGHT - Reduces size of DHCP CONFIG_NET_RESOLV_ENTRIES - Number of resolver entries |